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Debt - Additional Information (Detail) |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |
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Nov. 01, 2019 | Aug. 09, 2019 USD ($) | Feb. 09, 2019 | Nov. 01, 2018 $ / shares | Jul. 26, 2018 USD ($) | Nov. 07, 2017 USD ($) | Aug. 31, 2019 USD ($) $ / shares | Aug. 31, 2017 USD ($) | Jan. 31, 2016 USD ($) | Jun. 30, 2014 USD ($) $ / shares | Jul. 31, 2013 USD ($) $ / shares | Sep. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) $ / shares | Mar. 31, 2019 USD ($) | Jun. 30, 2017 USD ($) shares | Mar. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) | Dec. 31, 2019 USD ($) $ / shares | Aug. 01, 2018 USD ($) | Jun. 14, 2018 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.001 |  |  |  |  | $ 0.001 |  |
Unrealized loss (gain) on fair value adjustment |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,675,000 | $ (2,423,000) |  |  |  |  |  |
Payment-in-kind interest |  |  |  |  |  |  |  |  |  |  |  |  | 1,155,000 | 0 |  |  |  |  |  |
Value of debt outstanding |  |  |  |  |  |  |  |  |  |  |  |  | 45,650,000 |  |  |  |  | $ 52,658,000 |  |
Debt issuance cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,300,000
Amortization of debt discount |  |  |  |  |  |  |  |  |  |  |  |  | $ 693,000 | 0 |  |  |  |  |  |
4.25% Convertible Senior Notes (due 2018) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  | $ 100,000,000.0 |  |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  |  |  |  |  |  |  | 4.25% |  |  |  |  |  |  |  |  |
Debt instrument, conversion rate (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 8.74 |  |  |  |  |  |  |  |  |
Debt instrument repurchase amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 12,000,000.0 | $ 39,100,000 | $ 6,100,000 |  |  |
Write-off of debt issuance costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000 |  | $ 100,000 |  |  |
Payment for repurchase of convertible notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 24,100,000 |  |  |  |
Debt instrument shares common stock issued upon conversion (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,900,000 |  |  |  |
Gain recognized on retirement of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000 |  |  |  |  |
Conversion rate |  |  |  |  |  |  |  |  |  |  | 0.1143674 |  |  |  |  |  |  |  |  |
4.25% Convertible Senior Notes (due 2018) | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument repurchase amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 11,600,000 |  |  |  |  |
Debt instrument shares common stock issued upon conversion (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 112,400 |  |  |  |  |
3.25% Convertible Senior Notes (due 2020) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  | $ 8,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  | 3.25% |  |  | 3.25% |  |  |  |  |  |  |  |  |  |  |  |
Debt conversion price, percentage | 105.00% |  |  | 105.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
4.875% convertible senior notes due 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  | $ 113,000,000.0 |  |  | $ 115,000,000.0 |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  |  |  |  |  |  | 4.875% |  |  | 4.875% |  |  |  |  |  |  |
Debt instrument, conversion rate (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  | $ 9.64 |  |  |  |  |  |  |  |  |  |
Debt instrument repurchase amount |  |  |  |  |  |  |  |  | $ 2,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Write-off of debt issuance costs |  | $ 700,000 |  |  |  |  |  |  | 100,000 |  |  |  |  |  |  |  |  |  |  |
Gain recognized on retirement of debt |  | (2,400,000) |  |  |  |  |  |  | $ 100,000 |  |  |  |  |  |  |  |  |  |  |
Conversion rate |  |  |  |  |  |  |  |  |  | 0.1037613 |  |  |  |  |  |  |  |  |  |
Value of debt outstanding |  |  |  |  |  |  | 111,100,000 |  |  |  |  |  | $ 1,905,000 |  |  |  |  | 1,905,000 |  |
Debt refinanced, exchanged into similar debt instruments |  |  |  |  |  |  | 103,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of accrued interest refinanced |  |  |  |  |  |  | 1,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of debt exchanged into a new debt instrument |  |  |  |  |  |  | $ 7,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible senior notes, net of debt issuance costs |  |  |  |  |  |  |  |  |  |  |  |  | 1,900,000 |  |  |  |  |  |  |
Convertible senior note payable, fair value |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,800,000 |  |  |  |  | $ 1,700,000 |  |
3.25% convertible senior notes due 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  |  |  |  | 3.25% |  |  |  |  | 3.25% |  |  |  |  | 3.25% |  |
Debt conversion price, percentage |  |  |  |  |  |  | 105.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate if paid in cash |  |  |  |  |  |  |  |  |  |  |  |  | 3.25% |  |  |  |  |  |  |
Interest rate if paid in stock |  |  |  |  |  |  |  |  |  |  |  |  | 5.00% |  |  |  |  |  |  |
Paid in kind interest rate |  |  |  |  |  |  |  |  |  |  |  |  | 2.75% |  |  |  |  |  |  |
Conversion rate |  |  | 1.00 |  |  |  | 1.00 |  |  |  |  |  |  |  |  |  |  |  |  |
Threshold percentage of stock price trigger |  |  |  |  |  |  | 30.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Threshold percentage of market price trigger |  |  |  |  |  |  | 150.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  |  |  | 49.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Value of debt outstanding |  |  |  |  |  |  |  |  |  |  |  |  | $ 43,745,000 |  |  |  |  | $ 50,753,000 |  |
Convertible Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of debt discount |  |  |  |  |  |  |  |  |  |  |  |  | 0 | $ 200,000 |  |  |  |  |  |
Oasis Management and Oasis Investments ll Master Fund Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 0.001 |  |  |  |  |  |  |  |  |  |  |  |  |
Oasis Management and Oasis Investments ll Master Fund Ltd. | 3.25% Convertible Senior Notes (due 2020) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  | $ 21,600,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  |  |  |  | 3.25% |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, conversion rate (in dollars per share) | $ / shares |  |  |  | $ 2.54 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain recognized on retirement of debt |  |  |  |  | $ (500,000) | $ (600,000) | $ (10,400,000) |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, amount redeemed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 13,200,000 |
Conversion rate |  |  |  | 0.3937008 | 0.3222688 |  |  | 0.3280302 |  |  |  |  |  |  |  |  |  |  |  |
Unrealized loss (gain) on fair value adjustment |  |  |  |  |  |  |  |  |  |  |  |  | (7,000,000.0) |  |  |  |  |  |  |
Payment-in-kind interest |  |  |  |  |  |  |  |  |  |  |  |  | 700,000 |  |  |  |  |  |  |
Oasis Management and Oasis Investments ll Master Fund Ltd. | 3.25% convertible senior notes due 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  | $ 8,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Debt | New Term Loan Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  |  |  | 10.50% |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate if paid in cash |  |  |  |  |  |  | 8.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Paid in kind interest rate |  |  |  |  |  |  | 2.50% |  |  |  |  |  |  |  |  |  |  |  |  |
Value of debt outstanding |  |  |  |  |  |  |  |  |  |  |  |  | 134,801,000 |  |  |  |  | 134,801,000 |  |
Debt issuance cost |  | 3,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization expense debt issuance |  |  |  |  |  |  |  |  |  |  |  |  | 300,000 |  |  |  |  |  |  |
Debt discount |  | $ 10,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of debt discount |  |  |  |  |  |  |  |  |  |  |  |  | 700,000 |  |  |  |  |  |  |
Line of credit facility maximum borrowing capacity |  |  |  |  |  |  | $ 134,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Long term debt |  |  |  |  |  |  |  |  |  |  |  |  | $ 114,800,000 |  |  |  |  | $ 123,400,000 |  |
Secured Debt | New Term Loan Agreement | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Covenant, EBITDA requirement |  |  |  |  |  |  |  |  |  |  |  | $ 34,000,000.0 |  |  |  |  |  |  |  |
Minimum liquidity requirement |  |  |  |  |  |  |  |  |  |  |  | $ 10,000,000.0 |  |  |  |  |  |  |  |

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- Definition Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28541-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
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- Definition Amount of amortization expense attributable to debt issuance costs. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(8)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399 + Details
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- Definition Fair value portion of borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock. + References No definition available. + Details
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- Definition The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 + Details
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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=119400593&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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- Definition The price per share of the conversion feature embedded in the debt instrument. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031898-161870 + Details
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