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Stockholders' Equity - Restricted Stock Units (Details)
6 Months Ended
Jun. 30, 2019
$ / shares
shares
Restricted Stock Units  
Outstanding at beginning of period (in shares) | shares 292,871
Canceled/forfeited (in shares) | shares (129,896)
Outstanding at end of period (in shares) | shares 162,975
Weighted Average Grant Date Fair Value  
Outstanding at beginning of period (in dollars per share) | $ / shares $ 3.78
Canceled/forfeited (in dollars per share) | $ / shares 2.67
Outstanding at end of period (in dollars per share) | $ / shares $ 4.67
Weighted Average Remaining Contractual Life (in years)  
Outstanding at end of period 5 years 6 months
Restricted Stock Units  
Restricted Stock Units  
Outstanding at beginning of period (in shares) | shares 546,858
Granted (in shares) | shares 27,187
Released (in shares) | shares (377,894)
Canceled/forfeited (in shares) | shares (152,441)
Outstanding at end of period (in shares) | shares 43,710
Weighted Average Grant Date Fair Value  
Outstanding at beginning of period (in dollars per share) | $ / shares $ 2.54
Granted (in dollars per share) | $ / shares 1.16
Released (in dollars per share) | $ / shares 2.54
Canceled/forfeited (in dollars per share) | $ / shares 2.32
Outstanding at end of period (in dollars per share) | $ / shares $ 2.62
Weighted Average Remaining Contractual Life (in years)  
Outstanding at end of period 1 year 6 months