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401(k) plan
12 Months Ended
Dec. 31, 2016
Compensation and Retirement Disclosure [Abstract]  
401(k) plan
401(k) plan
The Company maintains a 401(k) plan for its employees. Employee contributions are voluntary. The Company may match employee contributions in amounts to be determined at the Company’s sole discretion. The Company provides a 50% matching contribution for up to the first 6% of each contributing employee’s base salary contributions. The Company made matching contributions to the 401(k) plan and recorded expense of approximately $1.1 million, $0.7 million and $0.3 million for the years ended December 31, 2016, 2015 and 2014, respectively.