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Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Current assets: |  |
Cash and cash equivalents | $ 18,873 | $ 7,475
Short-term investments | 13,328 | 38,497
Accounts receivable, net of allowances for doubtful accounts and other adjustments of $ 482 (2012) and $1,382 (2011) | 8,953 | 8,525
Income tax receivable | 681 | 8,293
Inventories, net of reserves for excess and obsolete inventory of $ 352 (2012) and $417 (2011) | 176 | 309
Prepaid expenses and other current assets | 903 | 1,138
Deferred tax asset | 89 | 8
Total current assets | 43,003 | 64,245
Equipment and improvements, net | 11,211 | 15,482
Other assets | 181 | 214
Total assets | 54,395 | 79,941
Current liabilities: |  |
Accounts payable | 1,978 | 3,181
Accrued liabilities | 4,829 | 7,641
Deferred revenue | 1,436 | 703
Total current liabilities | 8,243 | 11,525
Non-current liabilities: |  |
Deferred rent and other long term liabilities | 3,399 | 3,546
Deferred tax liability | 91 | 10
Total non-current liabilities | 3,490 | 3,556
Commitments and contingencies (Note 6) |  |
Stockholders' equity: |  |
Preferred stock, par value $0.001 per share; 5,000,000 shares authorized; none issued or outstanding |  |
Common stock, par value $0.001 per share; 100,000,000 shares authorized; 35,873,418 and 35,611,976 shares issued and outstanding at December 31,2012 and December 31, 2011, respectively | 36 | 36
Additional paid-in capital | 211,165 | 207,927
Accumulated comprehensive deficit | (168,539) | (143,103)
Total stockholders' equity | 42,662 | 64,860
Total liabilities and stockholders' equity | $ 54,395 | $ 79,941

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