Organization and Capitalization - Additional Information (Detail)		1 Months Ended
	Dec. 11, 2019	Dec. 31, 2018 USD ($) shares	Dec. 31, 2019 shares	Dec. 06, 2013 $ / shares shares
Organization And Capitalization [Line Items]
Reverse stock split, conversion ratio	0.07692307692000
Common stock, shares authorized (in shares)		750,000,000	750,000,000
Preferred stock, shares authorized (in shares)				25,000,000
Preferred stock, par value (in dollars per share) | $ / shares				$ 0.01
Minimum
Organization And Capitalization [Line Items]
Common stock, shares authorized (in shares)				225,000,000
Maximum
Organization And Capitalization [Line Items]
Common stock, shares authorized (in shares)				750,000,000
China National Scientific and Instruments and Materials Company
Organization And Capitalization [Line Items]
Proceeds from distribution agreement | $		$ 15,000,000.0
Distribution minimum royalties payment | $		14,000,000.0
China National Scientific and Instruments and Materials Company | Minimum
Organization And Capitalization [Line Items]
Expected proceeds from distribution agreement | $		$ 29,000,000.0