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Fair Value Measurement - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 05, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |  |  |
Redeemable Convertible preferred stock, shares issued |  | 600,000 |  | 600,000 |  | 600,000
Expected volatility rate |  |  |  | 35.00% |  | 40.00%
Risk free interest rate |  |  |  | 0.40% |  | 0.60%
Expected probability of occurrence |  |  |  | 90.00% |  | 90.00%
Mandatory conversion, expected term |  |  |  | 6 months |  | 12 months
Net income |  | $ (16,645) | $ (3,919) | $ 61,314 | $ (71,901) | $ (61,833)
Maximum [Member] |  |  |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |  |  |
Percentage of closing stock price |  |  |  | 10.00% |  |
Estimated net income |  |  |  | $ 39,400 |  |
Maximum [Member] | Volatility Assumption [Member] |  |  |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |  |  |
Percentage of closing stock price |  |  |  | 10.00% |  |
Estimated net income |  |  |  | $ 8,600 |  |
Maximum [Member] | Transaction Occurring Assumption [Member] |  |  |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |  |  |
Percentage of closing stock price |  |  |  | 10.00% |  |
Estimated net income |  |  |  | $ 6,500 |  |
Minimum [Member] |  |  |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |  |  |
Percentage of closing stock price |  |  |  | 10.00% |  |
Estimated net income |  |  |  | $ 42,500 |  |
Minimum [Member] | Volatility Assumption [Member] |  |  |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |  |  |
Percentage of closing stock price |  |  |  | 10.00% |  |
Estimated net income |  |  |  | $ 4,200 |  |
Minimum [Member] | Transaction Occurring Assumption [Member] |  |  |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |  |  |
Percentage of closing stock price |  |  |  | 10.00% |  |
Estimated net income |  |  |  | $ 6,500 |  |
Redeemable Convertible Series B Preferred Stock [Member] |  |  |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |  |  |
Capital | $ 600,000 |  |  |  |  |
Redeemable Convertible preferred stock, shares issued | 600,000 | 600,000 |  | 600,000 |  | 600,000
Preferred stock liquidation preference per share | $ 1,000 |  |  |  |  |
Preferred stock dividend rate calculated on interest rate | 3.00% |  |  |  |  |
Conversion floor price of common stock |  | $ 1.75 |  | $ 1.75 |  |
Redeemable Convertible Series B Preferred Stock [Member] | Maximum [Member] |  |  |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |  |  |
Common stock value per share |  | $ 2.25 |  | $ 2.25 |  |

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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=51831255 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(22)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(18)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=51831270 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(20)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition The per share liquidation preference (or restrictions) of stock classified as temporary equity that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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