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Organization and Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($) Segment	Mar. 31, 2016	Jan. 01, 2017 USD ($)	Dec. 31, 2016 USD ($)
Organization And Summary Of Significant Accounting Policies [Line Items]
Cash and investments in marketable securities	$ 362,016			$ 389,102
Senior secured notes	250,000
Debt and capital lease obligation	254,500
Capital lease obligations	4,500
Capital lease obligations, current portion	$ 2,909			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%

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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.

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