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Debt (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Instrument [Line Items] |  |
Total debt, Principal | $ 40,000 |
Less: debt-current |  | $ (7,857)
Debt-non-current | 39,433 | 22,013
Term Loan Credit Agreement |  |
Debt Instrument [Line Items] |  |
Total debt, Principal | 40,000 |
Total debt, Unamortized Discount | (567) |
Total debt | 39,433 |
Debt - non-current, Principal | 40,000 |
Debt - non-current, Unamortized Discount | (567) |
Debt-non-current | $ 39,433 |
Oxford Term Loan Agreement |  |
Debt Instrument [Line Items] |  |
Total debt, Principal |  | 30,000
Total debt, Unamortized Discount |  | (130)
Total debt |  | 29,870
Less: debt - current, Principal |  | (7,857)
Less: debt-current |  | (7,857)
Debt - non-current, Principal |  | 22,143
Debt - non-current, Unamortized Discount |  | (130)
Debt-non-current |  | $ 22,013

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 4: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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