Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2017

Financial Assets Measured at Fair Value on Recurring Basis

The following table summarizes the Company’s financial assets measured at fair value on a recurring basis as of December 31 (in thousands):

				Fair Value Measurements
	Carrying Amount as of			As of December 31, 2016
	December 31, 2016			Level 1			Level 2			Level 3

Cash equivalents		$	15,312		$	15,312		$	—		$	—

				Fair Value Measurements
	Carrying Amount as of			As of December 31, 2017
	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

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 assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3) (in thousands):

	2017
Balance at January 1, 2017	$	—
Issuance of 3.25% Convertible Senior Notes due in 2020		22,161
Change in fair value		308
Balance at December 31, 2017	$	22,469

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,
	2016		2017
Raw materials	$	5,204	$	3,265
Finished goods		70,231		55,167
	$	75,435	$	58,432

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):

	2015
			Weighted
			Average
	Income		Shares		Per Share
Basic EPS
Income available to common stockholders	$	23,254		19,435	$	1.20
Effect of dilutive securities:
Assumed conversion of convertible senior notes		7,385		23,369
Options and warrants		—		—
Unvested performance stock grants		—		347
Unvested restricted stock grants		—		170
Diluted EPS
Income available to common stockholders plus assumed exercises and conversion	$	30,639		43,321	$	0.71

	2016
			Weighted
			Average
	Income		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
				Weighted
				Average
	Loss			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	)