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Organization and Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2017 USD ($) | Sep. 30, 2016 | Sep. 30, 2017 USD ($) Segment | Sep. 30, 2016 | Jan. 01, 2017 USD ($) | Dec. 31, 2016 USD ($)
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Cash and investments in marketable securities | $ 412,163 |  | $ 412,163 |  |  | $ 389,102
Senior secured notes | 250,000 |  | 250,000 |  |  |
Debt and capital lease obligation | 253,000 |  | 253,000 |  |  |
Capital lease obligations | 3,000 |  | 3,000 |  |  |
Capital lease obligations, current portion | $ 2,482 |  | $ 2,482 |  |  | 2,908
Number of operating business segment | Segment |  |  | 1 |  |  |
Adoption of New Accounting Principles [Member] | Other Current Assets [Member] |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Impact of reclassification due to adoption of new accounting pronouncement |  |  |  |  | $ 300 |
Accumulated Deficit [Member] | Adoption of New Accounting Principles [Member] |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Impact of reclassification due to adoption of new accounting pronouncement |  |  |  |  | $ 200 |
Federal [Member] | Stock Option Windfall Deductions | Adoption of New Accounting Principles [Member] |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Impact of reclassification due to adoption of new accounting pronouncement |  |  |  |  |  | 20,600
State [Member] | Stock Option Windfall Deductions | Adoption of New Accounting Principles [Member] |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Impact of reclassification due to adoption of new accounting pronouncement |  |  |  |  |  | $ 9,800
India |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Effective income tax rate – India | 35.00% | 35.00% | 35.00% | 35.00% |  |

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- Definition Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737 Reference 2: 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(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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