Employee Benefit Plans	12 Months Ended
Dec. 31, 2018
Compensation And Retirement Disclosure [Abstract]
Employee Benefit Plans	14. Employee Benefit Plans Defined Contribution Plan The Company sponsors a 401(k) Plan, which stipulates that eligible employees can elect to contribute to the 401(k) Plan, subject to certain limitations of eligible compensation. The Company may match employee contributions in amounts to be determined at the Company’s sole discretion. To date, the Company has not made any matching contributions. Severance Benefit Plan & Retention Cash Bonus Simultaneously with the Restructuring Plan, the Company established a Severance Benefit Plan (the “Plan”) for affected employees (See Note 13) as well as a retention plan for retained employees. The Plan provides payment of severance benefits to affected employees of the Company. The Company granted approximately 151,000 restricted stock units to retained employees with a two year vesting schedule and offered a cash retention bonus of 50% of each retained employees then current base salary, of which $1.5 million was paid in October 2018.

Employee Benefit Plans

12 Months Ended

Dec. 31, 2018

Compensation And Retirement Disclosure [Abstract]

14. Employee Benefit Plans

Defined Contribution Plan

The Company sponsors a 401(k) Plan, which stipulates that eligible employees can elect to contribute to the 401(k) Plan, subject to certain limitations of eligible compensation. The Company may match employee contributions in amounts to be determined at the Company’s sole discretion. To date, the Company has not made any matching contributions.

Severance Benefit Plan & Retention Cash Bonus

Simultaneously with the Restructuring Plan, the Company established a Severance Benefit Plan (the “Plan”) for affected employees (See Note 13) as well as a retention plan for retained employees. The Plan provides payment of severance benefits to affected employees of the Company. The Company granted approximately 151,000 restricted stock units to retained employees with a two year vesting schedule and offered a cash retention bonus of 50% of each retained employees then current base salary, of which $1.5 million was paid in October 2018.