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Borrowings - Senior Convertible Notes Due 2021 - Additional Information (Detail) $ / shares in Units, $ in Thousands					12 Months Ended
	Aug. 14, 2018 USD ($) $ / shares shares	May 31, 2018 USD ($)	May 25, 2018 USD ($) $ / shares shares	Oct. 23, 2017 USD ($) d $ / shares shares	Dec. 31, 2018 USD ($) shares	Dec. 31, 2017 USD ($) shares	Dec. 31, 2016 USD ($)
Debt Instrument [Line Items]
Principal amount					$ 101,700
Gain (loss) on extinguishment of debt					$ (765)	$ (1,611)	$ 72,024
Common stock, shares issued | shares					187,029,967	119,053,414
Common Stock
Debt Instrument [Line Items]
Number of shares sold in underwritten public offering | shares				973,236
5.75% Senior convertible notes due August 15, 2018
Debt Instrument [Line Items]
Senior notes, effective interest rate				5.75%
Principal amount				$ 27,700
Conversion price of shares | $ / shares				$ 34
Gain (loss) on extinguishment of debt						$ (800)
Unamortized debt issuance costs						300
Unamortized premium						200
No of convertible shares				194.1748
Principal amount per share | $ / shares				$ 1,000
Percentage of repurchase price				100.00%
Percentage of conversion price equaling stock price				120.00%
Number of trading days | d				10
Consecutive trading days				20 days
Debt Instrument, redemption description					The Company may elect at its option to cause all or any portion of the senior convertible notes to be mandatorily converted in whole or in part at any time prior to the close of business on the business day immediately preceding the maturity date, if the last reported sale price of its common stock exceeds 120% of the conversion price then in effect for at least 10 trading days in any 20 consecutive trading day period, ending within five business days prior to the date of the mandatory conversion notice. The redemption price is equal the sum of 100% of the principal amount of the senior convertible notes to be redeemed, plus accrued and unpaid interest.
Debt Issuance Cost					$ 800
2021 Notes
Debt Instrument [Line Items]
Senior notes, effective interest rate				5.75%	5.75%
Principal amount				$ 23,700	$ 18,690	23,690
Conversion price of shares | $ / shares				$ 5.15
Unamortized premium					$ 409	$ 721
Exchange price per share | $ / shares	$ 1.13
Conversion Option, shares | shares	475,520
2021 Notes | Accrued Interest
Debt Instrument [Line Items]
Conversion of notes to common shares, value	$ 500
2021 Notes | Maximum
Debt Instrument [Line Items]
Common stock, shares issued | shares				13,648,300
2021 Notes | Privately Negotiated Exchange Agreement
Debt Instrument [Line Items]
Gain (loss) on extinguishment of debt		$ 800
Common stock, shares issued | shares			2,250,000
Conversion of notes to common shares, value			$ 5,000
Exchange price per share | $ / shares			$ 2.2567
Exchange completion date			May 31, 2018

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