Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 208,878	$ 85,921
Short-term investments, net	20,020	16,887
Accounts receivable, net	32,328	25,225
Inventories, net	36,208	38,443
Prepaid expenses and other current assets	6,642	5,925
Total current assets	304,076	172,401
Property, plant and equipment, net	19,311	19,380
Goodwill	1,190	1,190
Other intangible assets, net	7,841	7,794
Deferred financing costs, net	2,242	2,329
Other assets	3,387	3,405
Total assets	338,047	206,499
Current liabilities:
Accounts payable	12,969	12,024
Other accrued liabilities	17,218	22,020
Total current liabilities	30,187	34,044
Convertible senior notes, net	101,942	100,315
Other long-term liabilities	3,915	3,929
Commitments and contingencies - See Note 15
Stockholders' equity:
Preferred stock-$.001 par value; 5,000 shares authorized; no shares issued and outstanding at March 31, 2013 and December 31, 2012
Common stock-$.001 par value; 25,000 shares authorized; 16,345 and 14,582 shares issued and outstanding at March 31, 2013 and December 31, 2012, respectively	16	15
Additional paid-in capital	492,631	346,301
Accumulated deficit	(283,001)	(270,042)
Accumulated other comprehensive loss:
Cumulative translation adjustments	(7,587)	(8,039)
Unrealized loss on investments	(56)	(24)
Total accumulated other comprehensive loss	(7,643)	(8,063)
Total stockholders' equity	202,003	68,211
Total liabilities and stockholders' equity	$ 338,047	$ 206,499