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Debt - Additional Information (Detail) |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
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Aug. 09, 2019 USD ($) | Nov. 01, 2018 $ / shares | Jul. 26, 2018 USD ($) | Aug. 31, 2019 USD ($) $ / shares | Nov. 30, 2017 USD ($) | Aug. 31, 2017 USD ($) | Jan. 31, 2016 USD ($) | Jun. 30, 2014 USD ($) $ / shares | Jul. 31, 2013 USD ($) $ / shares | Sep. 30, 2019 USD ($) $ / shares | Sep. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) shares | Mar. 31, 2017 USD ($) shares | Sep. 30, 2019 USD ($) $ / shares | Sep. 30, 2018 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2018 USD ($) $ / shares | Aug. 01, 2018 USD ($) | Jun. 14, 2018 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain recognized on retirement of debt |  |  |  |  |  |  |  |  |  | $ (13,205,000) | $ (453,000) |  |  | $ (13,205,000) | $ (453,000) |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  | $ 0.001 |  |  |  | $ 0.001 |  |  | $ 0.001 |  |
Unrealized loss (gain) on fair value adjustment |  |  |  |  |  |  |  |  |  | $ (463,000) | 917,000 |  |  | $ (2,992,000) | (2,514,000) |  |  |  |
Fair value of debt outstanding |  |  |  |  |  |  |  |  |  | $ 50,540,000 |  |  |  | 50,540,000 |  |  | $ 140,974,000 |  |
Amortization of debt discount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 393,000 | 0 |  |  |  |
Debt issuance cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,300,000
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 | $ 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  | 3.25% |  |  | 3.25% |  |  |  | 3.25% |  |  |  | 3.25% |  |  | 3.25% |  |
Debt conversion price, percentage |  | 105.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of debt outstanding |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  | $ 0 |  |  | $ 27,974,000 |  |
4.875% convertible senior notes due 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | $ 113,000,000 |  |  |  |  |  |  | $ 115,000,000 |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  |  |  |  | 4.875% |  | 4.875% |  |  |  | 4.875% |  |  |  |  |
Debt instrument, conversion rate (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 9.64 |  |  |  |  |  |  |  |  |  |  |
Debt instrument repurchase amount |  |  |  |  |  |  | $ 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |
Fair value of debt outstanding | 111,100,000 |  |  |  |  |  |  |  |  | $ 1,905,000 |  |  |  | $ 1,905,000 |  |  | 113,000,000 |  |
Debt refinanced, exchanged into similar debt instruments | 103,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of accrued interest refinanced | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of debt exchanged into a new debt instrument | 7,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible senior notes, net of debt issuance costs |  |  |  |  |  |  |  |  |  | 1,900,000 |  |  |  | 1,900,000 |  |  |  |  |
Convertible senior note payable, fair value |  |  |  |  |  |  |  |  |  | 1,800,000 |  |  |  | $ 1,800,000 |  |  | 93,200,000 |  |
Amortization of debt discount |  |  |  |  |  |  |  |  |  | $ 400,000 | 0 |  |  |  | 0 |  |  |  |
Debt issuance cost | $ 10,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
3.25% convertible senior notes due 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  |  |  |  |  |  | 3.25% |  |  |  | 3.25% |  |  |  |  |
Debt conversion price, percentage |  |  |  | 105.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate if paid in cash |  |  |  |  |  |  |  |  |  | 3.25% |  |  |  | 3.25% |  |  |  |  |
Interest rate if paid in stock |  |  |  |  |  |  |  |  |  | 5.00% |  |  |  | 5.00% |  |  |  |  |
Paid in kind interest rate |  |  |  |  |  |  |  |  |  | 2.75% |  |  |  | 2.75% |  |  |  |  |
Conversion rate |  |  |  | 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% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of debt outstanding |  |  |  |  |  |  |  |  |  | $ 48,635,000 |  |  |  | $ 48,635,000 |  |  | 0 |  |
Convertible Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of debt discount |  |  |  |  |  |  |  |  |  | 100,000 | 200,000 |  |  | 500,000 | 700,000 |  |  |  |
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 |  |  |  |  |  | $ 21,600,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  |  | 3.25% |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, conversion rate (in dollars per share) | $ / shares |  | $ 2.54 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain recognized on retirement of debt |  |  |  | $ 10,400,000 | $ (500,000) | $ 600,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, amount redeemed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 13,200,000 |
Conversion rate |  | 0.3937008 | 0.3222688 |  |  | 0.3280302 |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized loss (gain) on fair value adjustment |  |  |  |  |  |  |  |  |  | 500,000 | (900,000) |  |  | 500,000 | (2,500,000) |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of debt discount |  |  |  |  |  |  |  |  |  | 200,000 | $ 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% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of debt outstanding |  |  |  |  |  |  |  |  |  | $ 134,801,000 |  |  |  | 134,801,000 |  |  | $ 0 |  |
Amortization of debt discount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 200,000 | $ 0 |  |  |  |
Line of credit facility maximum borrowing capacity | $ 134,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Covenant, EBITDA requirement | 34,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum liquidity requirement | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance cost | $ 3,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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