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Equity Plan - Stock Option Activity (Details) - Options
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2017
USD ($)
$ / shares
shares
Number of Shares  
Outstanding at the beginning of the period (in shares) 1,719,091
Exercised (in shares) (52,586)
Forfeited or expired (in shares) (13,291)
Outstanding at the end of the period (in shares) 1,653,214
Vested or expected to vest (in shares) 1,554,021
Exercisable at the end of the period (in shares) 1,226,386
Weighted Average Exercise Price  
Outstanding at the beginning of the period (in dollars per share) | $ / shares $ 9.79
Exercised (in dollars per share) | $ / shares 6.94
Forfeited or expired (in dollars per share) | $ / shares 19.38
Outstanding at the end of the period (in dollars per share) | $ / shares $ 9.81
Additional Information  
Weighted Average Remaining Contractual Life - Outstanding at the end of the period (in years) 5 years 8 months 27 days
Weighted Average Remaining Contractual Life - Vested or expected to vest (in years) 5 years 8 months 27 days
Weighted Average Remaining Contractual Life - Exercisable at the end of the period (in years) 4 years 9 months 22 days
Aggregate Intrinsic Value - Outstanding at the end of the period (in dollars) | $ $ 8,627,192
Aggregate Intrinsic Value - Vested or expected to vest (in dollars) | $ 8,109,560
Aggregate Intrinsic Value - Exercisable at the end of the period (in dollars) | $ $ 6,728,248