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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2018
Accounting Policies [Abstract] |
Financial Assets Measured at Fair Value on Recurring Basis | The following table summarizes the Company’s financial asset and liabilities measured at fair value on a recurring basis as of December 31, 2017 and 2018 (in thousands):
| Carrying Amount as of December 31, 2017 |  | Fair Value Measurements As of December 31, 2017
|  | Level 1 |  | Level 2 |  | Level 3
Cash equivalents | $ | 13,718 |  |  | $ | 13,718 |  |  | $ | — |  |  | $ | — |
3.25% Convertible senior notes due in 2020 | 22,469 |  |  | — |  |  | — |  |  | 22,469 |
| Carrying Amount as of December 31, 2018 |  | Fair Value Measurements As of December 31, 2018
|  | Level 1 |  | Level 2 |  | Level 3
Cash equivalents | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
3.25% Convertible senior notes due in 2020 | 27,974 |  |  | — |  |  | — |  |  | 27,974 |
Reconciliation of Beginning and Ending Balances of Assets Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3) | The following table provides a reconciliation of the beginning and ending balances of liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) (in thousands):
| Year ended December 31,
| 2017 |  | 2018
Balance at January 1, | $ | — |  |  | $ | 22,469 |
Issuance of 3.25% convertible senior notes | 21,550 |  |  | 8,000 |
Loss on extinguishment of convertible senior notes | 611 |  |  | 453 |
Change in fair value | 308 |  |  | (2,948 | )
Balance at December 31, | $ | 22,469 |  |  | $ | 27,974 |
Net of Inventory Obsolescence Reserve | Inventory, which includes the ex-factory cost of goods, capitalized warehouse costs and in-bound freight and duty, is valued at the lower of cost (first-in, first-out) or market, net of inventory obsolescence reserve, and consists of the following (in thousands):
| December 31,
| 2017 |  | 2018
Raw materials | $ | 477 |  |  | $ | 311 |
Finished goods | 57,955 |  |  | 53,569 |
| $ | 58,432 |  |  | $ | 53,880 |
Property and Equipment, Estimated Useful Lives | Property and equipment Property and equipment are stated at cost and are being depreciated using the straight-line method over their estimated useful lives as follows:
Office equipment | 5 years
Automobiles | 5 years
Furniture and fixtures | 5 - 7 years
Leasehold improvements | Shorter of length of lease or 10 years
Reconciliation of the Weighted-Average Shares Used in Computation of Basic and Diluted Earnings Per Share | The following table is a reconciliation of the weighted-average shares used in the computation of basic and diluted earnings per share (“EPS”) for the periods presented (in thousands, except per share data):
| 2016
| Income |  | Weighted Average Shares |  | Per Share
Basic EPS |  |  |  |  |
Income available to common stockholders | $ | 1,243 |  |  | 16,542 |  |  | $ | 0.08 |
Effect of dilutive securities: |  |  |  |  |
Assumed conversion of convertible senior notes | — |  |  | — |  |  |
Options and warrants | — |  |  | — |  |  |
Unvested performance stock grants | — |  |  | — |  |  |
Unvested restricted stock grants | — |  |  | 123 |  |  |
Diluted EPS |  |  |  |  |
Income available to common stockholders plus assumed exercises and conversion | $ | 1,243 |  |  | 16,665 |  |  | $ | 0.07 |
| 2017
| Loss |  | Weighted Average Shares |  | Per Share
Basic EPS |  |  |  |  |
Loss attributable to common stockholders | $ | (83,085 | ) |  | 21,341 |  |  | $ | (3.89 | )
Effect of dilutive securities: |  |  |  |  |
Assumed conversion of convertible senior notes | — |  |  | — |  |  |
Options and warrants | — |  |  | — |  |  |
Unvested performance stock grants | — |  |  | — |  |  |
Unvested restricted stock grants | — |  |  | — |  |  |
Diluted EPS |  |  |  |  |
Loss attributable to common stockholders plus assumed exercises and conversion | $ | (83,085 | ) |  | 21,341 |  |  | $ | (3.89 | )
| 2018
| Loss |  | Weighted Average Shares |  | Per Share
Basic EPS |  |  |  |  |
Loss attributable to common stockholders | $ | (42,368 | ) |  | 23,104 |  |  | $ | (1.83 | )
Effect of dilutive securities: |  |  |  |  |
Assumed conversion of convertible senior notes | — |  |  | — |  |  |
Options and warrants | — |  |  | — |  |  |
Unvested performance stock grants | — |  |  | — |  |  |
Unvested restricted stock grants | — |  |  | — |  |  |
Diluted EPS |  |  |  |  |
Loss attributable to common stockholders plus assumed exercises and conversion | $ | (42,368 | ) |  | 23,104 |  |  | $ | (1.83 | )

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- Definition Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19279-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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