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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

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