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Common and Preferred Stock - Additional Information (Detail) |  |  |  |  |  | 1 Months Ended | 12 Months Ended |  |  |  |  |
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Oct. 23, 2017 shares | Oct. 10, 2017 USD ($) $ / shares shares | Mar. 01, 2017 shares | Nov. 16, 2015 shares | Nov. 12, 2015 | Nov. 30, 2017 USD ($) $ / shares shares | Nov. 30, 2015 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) shares | Dec. 31, 2014 USD ($) $ / shares shares | Dec. 13, 2017 $ / shares shares | Sep. 30, 2016 shares | May 31, 2016 $ / shares | Nov. 09, 2015 shares | Oct. 23, 2015 shares
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized |  |  | 140,000,000 |  |  |  |  | 280,000,000 | 140,000,000 |  |  | 280,000,000 | 700,000,000 |  |  |
Common stock, par value | $ / shares |  |  |  |  |  |  |  | $ 0.01 | $ 0.01 |  |  | $ 0.01 |  |  |  |
Undesignated preferred stock, shares authorized |  |  |  |  |  |  |  | 10,000,000 | 10,000,000 |  |  | 10,000,000 |  |  |  |
Undesignated preferred stock, par value | $ / shares |  |  |  |  |  |  |  | $ 0.01 | $ 0.01 |  |  | $ 0.01 |  |  |  |
Common stock, shares issued |  |  |  |  |  |  |  | 119,053,414 | 95,680,831 |  |  |  |  |  |  |
Common stock, shares outstanding |  |  |  |  |  |  |  | 119,053,414 | 95,680,831 |  |  |  |  |  |  |
Undesignated preferred stock, shares outstanding |  |  |  |  |  |  |  | 0 | 0 |  |  |  |  |  |  |
Amount of net proceeds from issuance of securities | $ |  |  |  |  |  |  |  | $ 564,000 |  | $ 28,392,000 |  |  |  |  |  |
Stock split of common stock |  |  | 0.2 |  |  |  |  |  |  |  |  |  |  |  |  |
Reverse stock split, description |  |  |  |  |  |  |  | The Company’s board of directors approved a 1-for-5 reverse stock split of its outstanding common stock. On March 1, 2017, the Company filed with the Secretary of State of the State of Delaware a Certificate of Amendment of the Company’s Amended and Restated Certificate of Incorporation (the “Charter Amendment”) to effect the 1-for-5 reverse stock split of the Company’s outstanding common stock (the “Reverse Stock Split”) and to reduce the authorized number of shares of the Company’s common stock from 700,000,000 to 140,000,000 shares. The Company’s common stock began trading on the NASDAQ Global Market on a split-adjusted basis when the market opened on March 3, 2017. As a result, all common stock share amounts included in these consolidated financial statements have been retroactively reduced by a factor of five, and all common stock per share amounts have been increased by a factor of five, with the exception of the Company’s common stock par value. |  |  |  |  |  |  |  |
Common stock shares sold aggregate price | $ |  |  |  |  |  |  |  | $ 564,000 |  | 27,843,000 |  |  |  |  |  |
Issuance costs associated with the Tel Aviv Stock Exchange | $ |  |  |  |  |  |  |  | $ 17,000 |  | 548,000 |  |  |  |  |  |
Percentage of shares of common stock issued for offering |  |  |  | 1.15% |  |  |  |  |  |  |  |  |  |  |  |
Restricted warrants issued to purchase number of common stock for offering |  |  |  | 32,000 |  |  |  | 32,000 |  |  |  |  |  |  |  |
Exercise price of restricted warrants per share in connection with the offering | $ / shares |  |  |  |  |  |  |  | $ 13.05 |  |  |  |  |  | $ 7.50 |  |
Warrants exercisable period |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |
Common stock loaned under share lending agreement, shares |  |  |  |  |  |  |  |  |  |  | 1,800,000 |  |  |  |  |
Principal amount | $ |  |  |  |  |  |  |  | $ 157,800,000 |  |  |  |  |  |  |  |
Nominal lending fee | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 0.05 |  |  |  |  |
Returned shares of common stock under share lending agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,800,000
Proceeds from exercise warrants | $ |  |  |  |  |  |  |  |  | $ 0 | 10,123,000 |  |  |  |  |  |
Warrants expiration, date |  |  |  |  |  |  |  | Feb. 08, 2016 |  |  |  |  |  |  |  |
Senior convertible notes due August 15, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount | $ |  |  |  |  |  |  |  |  |  |  | $ 100,000,000 |  |  |  |  |
TEL AVIV STOCK EXCHANGE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,000,000 |
Number of shares sold during the period |  |  |  |  |  |  | 2,770,487 |  |  |  |  |  |  |  |  |
Percentage of shares price per share |  |  |  |  | 97.00% |  |  |  |  |  |  |  |  |  |  |
Common stock shares sold aggregate price | $ |  |  |  |  |  |  | $ 34,710,000 |  |  | 34,710,000 |  |  |  |  |  |
Share price | $ / shares |  |  |  |  |  |  | $ 13.05 |  |  |  |  |  |  |  |  |
Issuance costs associated with the Tel Aviv Stock Exchange | $ |  |  |  |  |  |  | $ 1,432,000 |  |  | $ 1,432,000 |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares sold during the period | 973,236 |  |  |  |  |  |  | 173,000 |  | 1,788,000 |  |  |  |  |  |
Stock split of common stock |  |  | 0.2 |  |  |  |  |  |  |  |  |  |  |  |  |
Reverse stock split, description |  |  |  |  |  |  |  | On March 1, 2017, the Company effected a 1-for-5 reverse stock split of the Company’s outstanding common stock. As a result, prior to March 1, 2017, all common stock share amounts included in these consolidated financial statements have been retroactively reduced by a factor of five, and all common stock per share amounts have been increased by a factor of five, with the exception of the Company’s common stock par value. |  |  |  |  |  |  |  |
Common stock shares sold aggregate price | $ |  |  |  |  |  |  |  | $ 2,000 |  | $ 18,000 |  |  |  |  |  |
Common stock loaned under share lending agreement, shares |  |  |  |  |  |  |  |  |  | 1,800,000 |  |  |  |  |  |
Common Stock | TEL AVIV STOCK EXCHANGE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares sold during the period |  |  |  |  |  |  |  |  |  | 2,771,000 |  |  |  |  |  |
Common stock shares sold aggregate price | $ |  |  |  |  |  |  |  |  |  | $ 28,000 |  |  |  |  |  |
Purchase Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock purchase agreements date |  | Oct. 10, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Placement agent fees |  | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase Agreements | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares sold during the period |  | 10,166,600 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exchange price per share | $ / shares |  | $ 6.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of net proceeds from issuance of securities | $ |  | $ 57,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Charitable Foundation | Common Stock | Chairman of Board of Directors |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares sold during the period |  | 166,600 |  |  |  |  |  |  |  |  |  |  |  |  |  |
At Market Issuance Sales Agreement | FBR Capital Markets & Co. | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares sold during the period |  |  |  |  |  | 173,327 |  |  |  |  |  |  |  |  |  |
Exchange price per share | $ / shares |  |  |  |  |  | $ 3.15 |  |  |  |  |  |  |  |  |  |
Amount of net proceeds from issuance of securities | $ |  |  |  |  |  | $ 500,000 |  |  |  |  |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized |  |  |  |  |  |  |  |  |  |  |  | 140,000,000 |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized |  |  |  |  |  |  |  |  |  |  |  | 280,000,000 |  |  |  |

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- Definition Description of the reverse stock split arrangement. Also provide the retroactive effect given by the reverse split that occurs after the balance sheet date but before the release of financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 4.C) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187143-122770 + Details
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