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Nature of Business and Significant Accounting Policies - Additional Information (Detail) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Sep. 30, 2011 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Nature Of Business And Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net loss | $ (21,306,000) | $ (5,093,000) | $ (7,892,000) | $ (9,122,000) | $ (14,912,000) | $ (31,933,000) | $ (4,500,000) | $ (37,921,000) |  | $ (43,413,000) | $ (89,266,000) | $ (24,892,000)
Cash, cash equivalents and short-term marketable securities | 19,500,000 |  |  |  |  |  |  |  |  | 19,500,000 |  |
Restricted marketable securities | 2,566,000 |  |  |  | 0 |  |  |  |  | 2,566,000 | 0 |
Working capital | 40,900,000 |  |  |  |  |  |  |  |  | 40,900,000 |  |
Maturity period of cash and cash equivalents |  |  |  |  |  |  |  |  |  | 3 months |  |
Maturity period of marketable securities |  |  |  |  |  |  |  |  |  | 3 months |  |
Goodwill impairment |  |  |  |  |  | 13,200,000 |  | 6,600,000 | 3,300,000 |  | 19,800,000 | 3,300,000
Revenue recognition |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 0
Recognized income tax position |  |  |  |  |  |  |  |  |  | 50.00% |  |
Developed technologies [Member] |  |  |  |  |  |  |  |  |  |  |  |
Nature Of Business And Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Period of amortization |  |  |  |  |  |  |  |  |  | 1 year |  |
Trade name [Member] |  |  |  |  |  |  |  |  |  |  |  |
Nature Of Business And Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Period of amortization |  |  |  |  |  |  |  |  |  | 3 years |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Nature Of Business And Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment useful lives |  |  |  |  |  |  |  |  |  | 18 months |  |
Period of warranty |  |  |  |  |  |  |  |  |  | 1 year |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Nature Of Business And Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment useful lives |  |  |  |  |  |  |  |  |  | 5 years |  |
Period of warranty |  |  |  |  |  |  |  |  |  | 3 years |  |

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