Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Cash flows from operating activities:
Net income (loss)	$ 14,669	$ (19,438)	$ 13,889
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	16,009	16,350	14,580
Realized gain on marketable securities	(9)
Loss on disposition of fixed assets	72
Stock-based compensation to employees and directors	3,527	3,051	5,056
Amortization of debt discount and deferred loan costs	73	127	391
(Gain) loss from early extinguishment of debt		1,253	(346)
Restructuring charge (reversals)	76		(569)
Changes in operating assets and liabilities:
Restricted cash	131	506	1,872
Accounts receivable, net	(5,772)	59	(1,920)
Inventories, net	(3,471)	9,121	(8,739)
Prepaid inventories, net	(885)	1,055	797
Prepaids and other assets	1,294	(456)	368
Other long-term assets, net	(267)	(160)	(215)
Accounts payable	(7,902)	2,944	(9,315)
Accrued liabilities	(459)	6,952	(2,575)
Deferred revenue	10,433	3,951	3,362
Other long-term liabilities	626	348	(314)
Net cash provided by operating activities	28,145	25,663	16,322
Cash flows from investing activities:
Purchases of marketable securities	(82)	(160)	(136)
Purchases of intangible assets	(6)	(4)	(396)
Sale of marketable securities prior to maturity	154
Investment in precious metals	(1,397)		(1,657)
Expenditures for fixed assets, including internal-use software and website development	(12,489)	(8,741)	(20,511)
Proceeds from sale of fixed assets	56
Net cash provided used in investing activities	(13,764)	(8,905)	(22,700)
Cash flows from financing activities:
Payments on capital lease obligations	(112)	(730)	(490)
Drawdowns on line of credit		17,000
Payments on line of credit	(17,000)
Capitalized financing costs		(140)
Proceeds from finance obligations		1,429	16,383
Payments on finance obligations		(24,918)	(841)
Paydown on direct financing arrangement	(236)	(216)	(197)
Payments to retire convertible senior notes		(34,615)	(24,865)
Purchase of redeemable stock			(26)
Purchase of treasury stock	(471)	(1,604)	(825)
Exercise of stock options			1,503
Net cash used in financing activities	(17,819)	(43,794)	(9,358)
Net decrease in cash and cash equivalents	(3,438)	(27,036)	(15,736)
Cash and cash equivalents, beginning of period	96,985	124,021	139,757
Cash and cash equivalents, end of period	93,547	96,985	124,021
Cash paid during the year:
Interest paid	582	2,369	2,534
Taxes paid	299	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	502	(33)	795
Equipment acquired under finance obligations		5,077	599
Equipment and software acquired under capital lease obligations			6
Lapse of rescission rights of redeemable stock		582	260
Issuance of common stock from treasury for 401(k) matching contribution			$ 87