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401(k) plan
12 Months Ended
Dec. 31, 2019
Retirement Benefits [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 provided an 100%, 92% and 84% matching contribution for up to the first 6% of each contributing employee’s base salary contributions for the years ended December 31, 2019, 2018 and 2017, respectively. The Company made matching contributions to the 401(k) plan and recorded expense of approximately $3.5 million, $2.2 million and $1.6 million for the years ended December 31, 2019, 2018 and 2017, respectively.