Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Details)

v3.8.0.1
Stock-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Stock Based Compensation        
Allocated Share-based Compensation Expense $ 1,499 $ 1,736 $ 4,376 $ 4,582
Fair value assumptions        
Dividend rate     0.00%  
Options        
Unrecognized compensation cost options $ 11,000   $ 11,000  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition     2 years  
Common Stock, Capital Shares Reserved for Future Issuance 2,800,000   2,800,000  
2014 Plan | Awards | Series A common stock        
Options        
Outstanding beginning balance (in shares)     454,000  
Exercised (in shares)     (49,000)  
Outstanding ending balance (in shares) 405,000   405,000  
Number of awards exercisable (in shares) 402,000   402,000  
WAEP Outstanding beginning balance (in dollars per share)     $ 32.47  
WAEP options exercised (in dollars per share)     26.85  
WAEP Outstanding ending balance (in dollars per share) $ 33.15   33.15  
WAEP options exercisable (in dollars per share) $ 33.06   $ 33.06  
Weighted average remaining contractual life outstanding     2 years 2 months 12 days  
Weighted average remaining contractual life exercisable     2 years 2 months 12 days  
Aggregate intrinsic value outstanding $ 25,000   $ 25,000  
Aggregate intrinsic value exercisable $ 25,000   $ 25,000  
2014 Plan | Awards | Series C common stock        
Options        
Outstanding beginning balance (in shares)     2,467,000  
Exercised (in shares)     (94,000)  
Outstanding ending balance (in shares) 2,373,000   2,373,000  
Number of awards exercisable (in shares) 851,000   851,000  
WAEP Outstanding beginning balance (in dollars per share)     $ 42.45  
WAEP options exercised (in dollars per share)     27.08  
WAEP Outstanding ending balance (in dollars per share) $ 43.06   43.06  
WAEP options exercisable (in dollars per share) $ 33.59   $ 33.59  
Weighted average remaining contractual life outstanding     5 years 4 months 24 days  
Weighted average remaining contractual life exercisable     2 years 3 months 18 days  
Aggregate intrinsic value outstanding $ 124,000   $ 124,000  
Aggregate intrinsic value exercisable 52,000   $ 52,000  
2014 Plan | Options        
Options        
Options granted (in shares)     0  
Operating expense        
Stock Based Compensation        
Allocated Share-based Compensation Expense 3 4 $ 5 2
Selling, general and administrative        
Stock Based Compensation        
Allocated Share-based Compensation Expense 1,429 1,596 4,032 4,363
Research and development        
Stock Based Compensation        
Allocated Share-based Compensation Expense 67 $ 136 $ 339 $ 217
Skyhook | LTIPs | PARs        
Options        
Grants (in shares)     3,300,000  
Skyhook | LTIPs | PSUs        
Options        
Grants (in shares)     0  
Skyhook | LTIPs | PARs and PSUs        
Options        
Fair value of outstanding grants 2,400   $ 2,400  
Other Current Liabilities | LTIPs | Level 3        
Options        
Fair value of outstanding grants $ 1,600   $ 1,600