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Net Income (Loss) Per Share - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2019 $ / shares shares
Company average common stock price for a given period exceeds conversion price $5.75 for 2020 Notes [Member] | Convertible Note due 2020 [Member] |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |
Incremental Common Shares Attributable to Dilutive Effect of Contingently Issuable Shares | shares | 7,962,609
Debt Instrument, Convertible, Conversion Price | $ / shares | $ 5.75
Company average common stock price for a given period exceeds conversion price $8.66 for 2024 Notes [Member] | Convertible Note due 2024 [Member] |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |
Incremental Common Shares Attributable to Dilutive Effect of Contingently Issuable Shares | shares | 13,337,182
Debt Instrument, Convertible, Conversion Price | $ / shares | $ 8.66

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