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Long-Term Debt - Summary of Long-Term Debt (Detail) - USD ($) $ in Thousands | Sep. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Total principal amount | $ 148,176 |  | $ 143,250
Less: unamortized discount and issuance costs | (10,004) |  | (13,821)
Total long-term debt | 138,172 |  | 129,429
Senior Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Total principal amount | 40,250 |  | 40,250
Total long-term debt | 39,392 |  | 39,231
Convertible Senior Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Total principal amount | 89,990 |  | 103,000
Less: unamortized discount and issuance costs |  | $ 1,591 |
Total long-term debt | 81,170 |  | $ 90,198
4% Promissory Note [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Total principal amount | 8,936 |  |
Total long-term debt | 8,771 |  |
3.75% Promissory Note [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Total principal amount | 9,000 |  |
Total long-term debt | $ 8,839 |  |

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- Definition Amount of unamortized debt discount (premium) and debt issuance costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: 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 + Details
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