Common Stock and Preferred Stock - Additional Information (Detail)			1 Months Ended						2 Months Ended	3 Months Ended		12 Months Ended
	Aug. 09, 2019 USD ($) $ / shares shares	Apr. 27, 2017 USD ($) shares	Jan. 31, 2020 shares	Aug. 31, 2019 shares	Jan. 31, 2019 USD ($) director shares	Jan. 31, 2018 USD ($) director executive_office shares	Jun. 30, 2017 USD ($) shares	Jun. 30, 2014 USD ($) $ / shares shares	Feb. 28, 2017 USD ($) director shares	Jun. 30, 2017 USD ($) shares	Mar. 31, 2017 USD ($) executive_office shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($) shares	Dec. 31, 2016 USD ($)
Class of Stock [Line Items]
Total number of shares authorized (in shares)												105,000,000
Common stock, shares authorized (in shares)												100,000,000	100,000,000
Common stock, par value (in dollars per share) | $ / shares												$ 0.001	$ 0.001
Preferred shares, shares authorized (in shares)												5,000,000
Preferred stock, par value (in dollars per share) | $ / shares												$ 0.001
Common stock, shares issued (in shares)												35,210,371	29,169,913
Common stock, shares outstanding (in shares)												35,210,371	29,169,913
Repurchase of common stock (in shares)								3,112,840
Repurchase of common stock, average price per share (in dollars per share) | $ / shares								$ 7.71
Repurchase of common stock, value | $								$ 24,000,000
Common stock issued (in shares)	5,853,002
Common stock issued, value | $	$ 4,200,000											$ 4,214,000
Repurchase of convertible senior notes | $												0	$ 0	$ 35,614,000
Shares vested				164,166
Cash dividend paid | $												$ 0	$ 0
Preferred stock, shares issued (in shares)	200,000											200,000	0
Preferred stock, par value (in dollars per share) | $ / shares	$ 0.001											$ 0.001	$ 0.001
Preferred stock, shares outstanding (in shares)												200,000	0
Initial value per share (in dollars per share) | $ / shares												$ 100
Preferred stock quarterly dividend rate												6.00%
Preferred stock accrued dividends | $												$ 483,000	$ 0
Dividends payable | $												$ 483,000
4.25% Convertible Senior Notes Due 2018
Class of Stock [Line Items]
Debt instrument shares common stock issued upon conversion (in shares)											2,900,000
Amount of convertible notes repurchased and retired | $							$ 12,000,000			$ 12,000,000	$ 39,100,000				$ 6,100,000
Repurchase of convertible senior notes | $							$ 11,600,000				$ 24,100,000
Restricted Stock
Class of Stock [Line Items]
Retirement of restricted stock (in shares)												(42,346)	(29,689)
Restricted stock surrendered, in values | $												$ 98,000	$ 79,000
Restricted stock vested (in shares)												692,464	194,800	187,224
Common Stock
Class of Stock [Line Items]
Common stock issued (in shares)												5,853,000
Common stock issued, value | $												$ 6,000
Retirement of restricted stock (in shares)												(55,000)		(9,000)
Common Stock | 4.25% Convertible Senior Notes Due 2018
Class of Stock [Line Items]
Debt instrument shares common stock issued upon conversion (in shares)							112,400		2,865,000	112,400				3,000,000
Common stock shares issued upon conversion of debt instrument, value | $							$ 400,000		$ 15,100,000					$ 15,500,000
Amount of convertible notes repurchased and retired | $							$ 11,600,000		$ 39,100,000	$ 11,600,000
Common Stock | Hong Kong Meisheng Cultural Co
Class of Stock [Line Items]
Common stock issued (in shares)		3,660,891
Common stock issued, value | $		$ 19,300,000
Executive officer
Class of Stock [Line Items]
Restricted stock issued (in shares)					3,061,224	1,914,894			873,787			190,981
Restricted stock issued, value | $					$ 4,500,000	$ 4,500,000			$ 4,500,000			$ 273,000
Number of executive officers					2	2					2
Non-employee directors
Class of Stock [Line Items]
Restricted stock issued (in shares)		13,319			328,230	249,480			94,102			54,704	41,580
Restricted stock issued, value | $		$ 100,000			$ 500,000	$ 600,000			$ 500,000			$ 100,000
Number of executive officers | director					6
Number of non-employee directors | director						6			5
Non-employee directors | Hong Kong Meisheng Cultural Co
Class of Stock [Line Items]
Restricted stock issued (in shares)		13,319
Restricted stock issued, value | $		$ 100,000
Redeemable Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares issued (in shares)	200,000
Number of shares outstanding in which, one director may be elected	50,000
Voting percentage required to change number of directors	80.00%
Preferred stock, liquidation preference percent	150.00%
Carrying Amount
Class of Stock [Line Items]
Derivative liability | $												5,247,000
Carrying Amount | Fair Value Measurements, Recurring | Redeemable Preferred Stock
Class of Stock [Line Items]
Derivative liability | $	$ 4,900,000											$ 5,200,000
Minimum
Class of Stock [Line Items]
Accretion percentage												20.00%
Maximum
Class of Stock [Line Items]
Accretion percentage												150.00%
Subsequent Event | Restricted Stock
Class of Stock [Line Items]
Restricted stock vested (in shares)			109,360