Basis of Presentation - Additional Information (Detail) - USD ($) $ in Thousands			1 Months Ended	6 Months Ended	9 Months Ended	12 Months Ended
	Feb. 10, 2021	Jan. 01, 2021	Feb. 28, 2021	Jun. 30, 2020	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Basis Of Presentation [Line Items]
Loss from operations						$ 18,536	$ 15,621	$ 20,885
Cash and cash equivalents, including restricted cash						17,876	6,101	$ 8,356	$ 11,896
Net accounts receivable						3,059	$ 8,760
Proceeds from the exercise of common stock warrants						46
Equity raise of gross proceeds			$ 14,400	$ 24,000	$ 24,000
Subsequent Event
Basis Of Presentation [Line Items]
Proceeds from issuance of common stock		$ 14,400
Proceeds from the exercise of common stock warrants		$ 15,000
Equity raise of gross proceeds	$ 14,400
SWK Loan
Basis Of Presentation [Line Items]
Working capital						$ 23,900