Balance Sheet Details - Schedule of Accrued Compensation and Accrued Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Accrued compensation:
Accrued paid time off	$ 545	$ 309
Accrued bonus and deferred compensation	1,244	465
Accrued severance	1	368
Total accrued compensation	1,790	1,142
Accrued liabilities:
Accrued consulting services	39	37
Accrued printing fees		55
Accrued advertising fees	44
Deferred rent	292	88
Other accrued expenses	109	38
Total accrued liabilities	$ 484	$ 218