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Fair Value Measurement - Additional Information (Detail) - USD ($) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 05, 2015 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities measured with fair value |  | $ 120,848,000 |  |  |  |  |  |  |  |  |  |  |  | $ 120,848,000 |  |
Redeemable Convertible preferred stock, shares issued |  | 600,000 |  |  |  | 0 |  |  |  |  |  |  |  | 600,000 | 0 |
Net income (loss) attributable to common and participating stockholders |  | $ 5,568,000 | $ (8,419,000) | $ (77,983,000) | $ 1,253,000 | $ (9,573,000) | $ (1,299,000) | $ 17,322,000 | $ (12,835,000) | $ 7,516,000 | $ (878,000) | $ (2,484,000) | $ (3,816,000) | $ (79,581,000) | $ (6,385,000) | $ 338,000
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of closing stock price |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% |  |
Estimated net loss |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 53,000,000 |  |
Maximum [Member] | Volatility Assumption [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of closing stock price |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% |  |
Estimated net loss |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9,900,000 |  |
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 loss |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 13,400,000 |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock liquidation preference per share |  |  |  |  |  | $ 10.00 |  |  |  |  |  |  |  |  | $ 10.00 |
Percentage of closing stock price |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% |  |
Estimated net loss |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 51,800,000 |  |
Minimum [Member] | Volatility Assumption [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of closing stock price |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% |  |
Estimated net loss |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,600,000 |  |
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 loss |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 13,400,000 |  |
Redeemable Convertible Series B Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital | $ 600,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redeemable Convertible preferred stock, shares issued | 600,000 | 600,000 |  |  |  | 0 |  |  |  | 0 |  |  |  | 600,000 | 0 | 0
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 |  |
Redeemable Convertible Series B Preferred Stock [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock liquidation preference per share | $ 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Level 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities measured with fair value |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  | $ 0 |

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- Definition Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1377-109256 + Details
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- Definition The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(d)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 + Details
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- Definition The number of securities classified as temporary equity that have been sold (or granted) to the entity's shareholders. Securities issued include securities outstanding and securities held in treasury. 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 210.5-02.27(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 28 -Subparagraph b -Article 5 + Details
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