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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net loss $ (4,758) $ (1,221)
Adjustments to reconcile net loss to net cash used in operating activities:    
Amortization of deferred revenue (678) (917)
Depreciation 509 418
Amortization of intangibles 2,742 15
Amortization of premium and discount on investments, net (116) (238)
Stock-based employee compensation 1,174 800
Stock-based compensation to Board of Directors and Scientific Advisory Board 224 213
Retirement plan benefit expense 417 388
(Increase) decrease in assets:    
Accounts receivable (1,870) 2,019
Inventory 1,936 (1,731)
Other current assets (3,703) (827)
Other assets 18 15
(Decrease) increase in liabilities:    
Accounts payable and accrued expenses (6,837) (1,987)
Other current liabilities 0 (1)
Deferred revenue 44 1,042
Net cash used in operating activities (10,898) (2,012)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of property and equipment (549) (1,802)
Additions to intangibles (69) 0
Purchase of investments (102,142) (139,512)
Proceeds from sale of investments 81,364 178,638
Net cash (used in) provided by investing activities (21,396) 37,324
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from the issuance of common stock 93 71
Repurchase of common stock (5,456) 0
Proceeds from the exercise of common stock options and warrants 66 541
Payment of withholding taxes related to stock-based employee compensation (2,796) (3,473)
Net cash used in financing activities (8,093) (2,861)
(DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS (40,387) 32,451
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD 85,923 111,795
CASH AND CASH EQUIVALENTS, END OF PERIOD 45,536 144,246
The following non-cash activities occurred:    
Unrealized loss on available-for-sale securities (3) (104)
Common stock issued to Board of Directors and Scientific Advisory Board that was earned in a previous period 300 328
Common stock issued to employees that was accrued for in a previous period, net of shares withheld for taxes 282 252
Property, equipment and intangible invoices included in accounts payable $ 909 $ 0