Summary of Significant Accounting Policies (Tables)

12 Months Ended

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	)