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Stockholders' Equity - Summary of RSU Activity Under Equity Incentive Plan (Details) - Restricted stock units
 12 Months Ended
Dec. 31, 2017
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
December 31, 2016 (shares) | shares 798,834
Granted (shares) | shares 1,035,443
Vested (shares) | shares (561,462)
Cancelled (shares) | shares (38,647)
December 31, 2017 (shares) | shares 1,234,168
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]  
December 31, 2016 ($ per share) | $ / shares $ 0.00
Granted ($ per share) | $ / shares 0.00
Vested ($ per share) | $ / shares 0.00
Cancelled ($ per share) | $ / shares 0.00
December 31, 2016 ($ per share) | $ / shares $ 0.00