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Long-term debt - Hercules Loan Agreement (Details) - USD ($) $ in Thousands |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 15, 2020 | Jun. 01, 2020 | Aug. 08, 2019 | Mar. 31, 2021 | Mar. 31, 2020
Debt Securities |  |  |  |  |
Loss on extinguishment of debt |  |  |  | $ (913) |
Interest expense |  |  |  | 818 | $ 734
Noncash interest expense |  |  |  | 181 | 156
Debt discount |  |  |  |  | 199
Hercules Loan Agreement |  |  |  |  |
Debt Securities |  |  |  |  |
Maximum borrowing capacity |  |  | $ 30,000 |  |
Borrowed amount |  |  | 10,000 |  |
Payment of issuance costs |  |  | 225 |  |
Additional closing and legal fees |  |  | $ 130 |  |
Total paid amount | $ 10,839 |  |  |  |
Outstanding principal | 10,000 |  |  |  | 0
Term charge | 495 |  |  |  |
Termination fee due | 300 |  |  |  |
Accrued interest | 44 |  |  |  |
Unused borrowing capacity available under the facility |  | $ 30,000 |  |  |
Upfront fees, including closing costs and legal fees |  |  |  | 355 |
Interest expense |  |  |  | 818 | 734
Noncash interest expense |  |  |  | 181 | 156
Accretion of the debt discount |  |  |  | 82 | 60
Accretion of the final payment |  |  |  | 99 | 96
Principal payments due or paid | 10,000 |  |  |  | $ 0
Hercules first amendment |  |  |  |  |
Debt Securities |  |  |  |  |
Additional closing and legal fees |  | 100 |  |  |
Upfront fees, including closing costs and legal fees |  |  |  | $ 100 |
Hercules loan agreement, second advance |  |  |  |  |
Debt Securities |  |  |  |  |
Maximum borrowing capacity |  | 40,000 |  |  |
Hercules loan agreement, third advance |  |  |  |  |
Debt Securities |  |  |  |  |
Maximum borrowing capacity |  | $ 10,000 |  |  |
Prime Rate | Hercules Loan Agreement |  |  |  |  |
Debt Securities |  |  |  |  |
Loss on extinguishment of debt | $ 913 |  |  |  |

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- Definition The cash outflow for additional closing and legal fees paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt. + References No definition available. + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: 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=120391452&loc=d3e13212-122682 Reference 2: 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=120398452&loc=d3e534808-122878 Reference 3: 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=120400017&loc=d3e572229-122910 + Details
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