Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Cash flows from operating activities:
Net income (loss)	$ (19,438)	$ 13,889	$ 7,747
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	16,350	14,580	12,883
Realized loss on marketable securities			48
Loss on disposition of fixed assets			183
Stock-based compensation to employees and directors	3,051	5,056	4,775
Stock-based compensation to consultants for services			10
Amortization of debt discount and deferred loan costs	127	391	331
(Gain) loss from early extinguishment of debt	1,253	(346)	(2,810)
Restructuring reversals		(569)	(66)
Changes in operating assets and liabilities:
Restricted cash	506	1,872	(152)
Accounts receivable, net	59	(1,920)	(4,540)
Inventories, net	9,121	(8,739)	1,344
Prepaid inventories, net	1,055	797	(2,118)
Prepaids and other assets	(456)	368	(604)
Other long-term assets, net	(160)	(215)	(120)
Accounts payable	2,944	(9,315)	18,642
Accrued liabilities	6,952	(2,575)	9,131
Deferred revenue	3,951	3,362	1,433
Other long-term liabilities	348	(314)
Net cash provided by operating activities	25,663	16,322	46,117
Cash flows from investing activities:
Purchases of marketable securities	(160)	(136)
Purchases of intangible assets	(4)	(396)
Sale of marketable securities prior to maturity			8,893
Investment in precious metals		(1,657)
Expenditures for fixed assets, including internal-use software and website development	(8,741)	(20,511)	(7,275)
Collection of note receivable			1,250
Net cash provided by (used in) investing activities	(8,905)	(22,700)	2,868
Cash flows from financing activities:
Payments on capital lease obligations	(730)	(490)	(348)
Drawdowns on line of credit	17,000		1,612
Payments on line of credit			(1,612)
Capitalized financing costs	(140)		(245)
Proceeds from finance obligations	1,429	16,383
Payments on finance obligations	(24,918)	(841)
Paydown on direct financing arrangement	(216)	(197)	(218)
Payments to retire convertible senior notes	(34,615)	(24,865)	(4,563)
Purchase of redeemable stock		(26)
Purchase of treasury stock	(1,604)	(825)	(340)
Exercise of stock options		1,503	29
Net cash used in financing activities	(43,794)	(9,358)	(5,685)
Net increase (decrease) in cash and cash equivalents	(27,036)	(15,736)	43,300
Cash and cash equivalents, beginning of period	124,021	139,757	96,457
Cash and cash equivalents, end of period	96,985	124,021	139,757
Cash paid during the year:
Interest paid	2,369	2,534	3,006
Taxes paid	260	187
Non-cash investing and financing activities:
Fixed assets, including internal-use software and website development, costs financed through accounts payable and accrued liabilities	(33)	795
Equipment acquired under finance obligations	5,077	599
Equipment and software acquired under capital lease obligations		6	1,632
Issuance of redeemable common stock			400
Lapse of rescission rights of redeemable stock	582	260	967
Issuance of common stock from treasury for 401(k) matching contribution		$ 87	$ 354