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Stockholders' Equity - Restricted Stock Units (Details)
 9 Months Ended
Sep. 30, 2017
$ / shares
shares
Restricted Stock Units  
Outstanding at beginning of period (in shares) | shares 530,734
Granted (in shares) | shares 192,984
Canceled/forfeited (in shares) | shares (298,720)
Outstanding at end of period (in shares) | shares 328,387
Weighted Average Grant Date Fair Value  
Outstanding at beginning of period (in dollars per share) | $ / shares $ 7.48
Granted (in dollars per share) | $ / shares 3.55
Canceled/forfeited (in dollars per share) | $ / shares 5.73
Outstanding at end of period (in dollars per share) | $ / shares $ 6.86
Weighted Average Remaining Contractual Life (in years)  
Outstanding at end of period 8 years
Restricted Stock Units  
Restricted Stock Units  
Outstanding at beginning of period (in shares) | shares 250,115
Granted (in shares) | shares 375,542
Released (in shares) | shares (115,622)
Canceled/forfeited (in shares) | shares (183,265)
Outstanding at end of period (in shares) | shares 326,770
Weighted Average Grant Date Fair Value  
Outstanding at beginning of period (in dollars per share) | $ / shares $ 6.34
Granted (in dollars per share) | $ / shares 3.18
Released (in dollars per share) | $ / shares 5.78
Canceled/forfeited (in dollars per share) | $ / shares 5.45
Outstanding at end of period (in dollars per share) | $ / shares $ 3.41
Weighted Average Remaining Contractual Life (in years)  
Outstanding at end of period 2 years 6 months