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Stockholders' Equity - Restricted Stock Units (Details)
 3 Months Ended
Mar. 31, 2016
$ / shares
shares
Restricted Stock Units  
Outstanding at beginning of period (in shares) | shares 602,207
Granted (in shares) | shares 123,790
Canceled/forfeited (in shares) | shares (6,506)
Outstanding at end of period (in shares) | shares 715,730
Weighted Average Grant Date Fair Value  
Outstanding at beginning of period (in dollars per share) | $ / shares $ 8.58
Granted (in dollars per share) | $ / shares 7.42
Canceled/forfeited (in dollars per share) | $ / shares 12.12
Outstanding at end of period (in dollars per share) | $ / shares $ 8.38
Weighted Average Remaining Contractual Life (in years)  
Outstanding at end of period 8 years 2 months 12 days
Restricted Stock Units  
Restricted Stock Units  
Outstanding at beginning of period (in shares) | shares 57,500
Granted (in shares) | shares 185,385
Canceled/forfeited (in shares) | shares (5,130)
Outstanding at end of period (in shares) | shares 237,755
Weighted Average Grant Date Fair Value  
Outstanding at beginning of period (in dollars per share) | $ / shares $ 7.31
Granted (in dollars per share) | $ / shares 7.09
Canceled/forfeited (in dollars per share) | $ / shares 5.50
Outstanding at end of period (in dollars per share) | $ / shares $ 7.18
Weighted Average Remaining Contractual Life (in years)  
Outstanding at end of period 2 years 4 months 24 days