Separation Obligation	12 Months Ended
Separation Obligation	Dec. 31, 2016
Compensation Related Costs [Abstract]
Separation Obligation	Separation Obligation In September 2016, Greg Bartoli's employment with the Company as Chief Operating Officer was terminated. In connection with his termination, Mr. Bartoli received a severance payment, including a prorated bonus payment and a 17% vesting acceleration of his unvested, previously awarded In-Plan Options, Non-Plan Options and Non-Plan RSA. The Company expensed $1,644 related to Mr. Bartoli's termination in the year ended December 31, 2016. These amounts were classified within Payroll and related expense in the consolidated statement of operations for the year ended December 31, 2016. Related amounts that remained unpaid as of December 31, 2016 were included in Accrued expenses in the consolidated balance sheet as of December 31, 2016.

The entire disclosure for compensation costs, including compensated absences accruals, compensated absences liability, deferred compensation arrangements and income statement compensation items. Deferred compensation arrangements may include a description of an arrangement with an individual employee, which is generally an employment contract between the entity and a selected officer or key employee containing a promise by the employer to pay certain amounts at designated future dates, usually including a period after retirement, upon compliance with stipulated requirements. This type of arrangement is distinguished from broader based employee benefit plans as it is usually tailored to the employee. Disclosure also typically includes the amount of related compensation expense recognized during the reporting period, the number of shares (units) issued during the period under such arrangements, and the carrying amount as of the balance sheet date of the related liability.