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Basic and Diluted Net Loss per Share - Summary of Potential Common Shares (Detail) - shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities	4,346,057	2,245,096
Stock Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Options outstanding (in shares)	1,830,958	1,529,964
Warrants Not Settleable in Cash
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of warrants outstanding (in shares)			1,012,513
Warrants Not Settleable in Cash \| Stock Warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of warrants outstanding (in shares)	2,071,172	333,034
Nonvested Restricted Stock Units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of warrants outstanding (in shares)		382,098	338,055
Nonvested Restricted Stock Units \| Nonvested Restricted Stock Units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of warrants outstanding (in shares)	443,927