Stockholders' Equity - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Apr. 12, 2018
Class of Stock [Line Items]
Common Stock, Voting Rights	Each share of common stock entitles the holder to one vote on all matters submitted to a vote of the Company’s stockholders.
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Share price (in dollars per share)			$ 13.70
Common stock, shares authorized (in shares)	25,000,000	100,000,000
Proceeds from Issuance or Sale of Equity	$ 15,106	$ 18,618
Common Stock From Series D Preferred Stock
Class of Stock [Line Items]
Convertible preferred stock, shares issued upon conversion (in shares)	534,333
Common Stock From Series F Preferred Stock
Class of Stock [Line Items]
Convertible preferred stock, shares issued upon conversion (in shares)	123,981	301,409
Common Stock From Series B Preferred Stock [Member]
Class of Stock [Line Items]
Convertible preferred stock, shares issued upon conversion (in shares)		93
Common Stock From Series E Preferred Stock [Member]
Class of Stock [Line Items]
Convertible preferred stock, shares issued upon conversion (in shares)		142,178
Preferred stock
Class of Stock [Line Items]
Preferred Stock, Shares Outstanding	0	0
Series F Convertible Preferred Stock
Class of Stock [Line Items]
Preferred Stock, Shares Outstanding	0	0
Preferred stock, shares designated (in shares)	10,621	10,621
Conversion of Stock, Shares Converted	3,260.70	7,927.05
Series D Convertible Preferred Stock
Class of Stock [Line Items]
Preferred Stock, Shares Outstanding	0	14,052.93
Preferred stock, shares designated (in shares)	21,300	21,300
Conversion of Stock, Shares Converted	14,052.93
Series E Convertible Preferred Stock
Class of Stock [Line Items]
Preferred Stock, Shares Outstanding	0	3,260.70
Preferred stock, shares designated (in shares)	7,000	7,000
Conversion of Stock, Shares Converted		3,739.3
Series B Convertible Preferred Stock
Class of Stock [Line Items]
Preferred Stock, Shares Outstanding	200	200
Preferred stock, shares designated (in shares)	147,000	147,000
Conversion of Stock, Shares Converted		300.00
Management Incentive [Member]
Class of Stock [Line Items]
Stock Issued During Period, Value, Other		$ 294,264
Management Incentive [Member] | Common Stock
Class of Stock [Line Items]
Shares issued during period (in shares)		21,479
Stock Issued During Period, Value, Other		$ 2