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CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Current assets: |  |
Cash and cash equivalents | $ 16,466 | $ 9,949
Restricted cash | 0 | 719
Short term investments | 61,678 | 0
Trade accounts receivable, net of allowance of $428 and $204 | 5,015 | 4,857
Inventories, net of provision for obsolescence of $439 and $1,913 | 5,212 | 4,274
Prepaid expenses and other current assets | 1,146 | 433
Current assets of discontinued operations | 0 | 2,315
Total current assets | 89,517 | 22,547
Property and equipment, net | 5,788 | 6,033
Purchased technology and license rights, net | 6 | 67
Goodwill | 185 | 185
Deposits | 73 | 92
Other assets | 41 | 67
Non-current assets of discontinued operations | 0 | 1,997
Total assets | 95,610 | 30,988
Current liabilities: |  |
Accounts payable | 1,423 | 1,583
Accrued severance and related | 727 | 1,242
Accrued payroll | 418 | 447
Current portion of mortgage note payable | 0 | 239
Accrued taxes and other liabilities | 0 | 214
Accrued bonus | 972 | 80
Accrued expenses | 2,505 | 861
Accrued warranty expense | 348 | 186
Other liabilities | 1,309 | 100
Current liabilities of discontinued operations | 0 | 1,021
Total current liabilities | 7,702 | 5,973
Mortgage note payable, net of current portion | 0 | 2,455
Note payable | 140 | 140
Deferred tax liability | 0 | 368
Derivative liabilities | 0 | 20
Total liabilities | 7,842 | 8,956
STOCKHOLDERS' EQUITY |  |
Common stock, $0.001 par value; 75,000,000 shares authorized; 33,847,100 issued and 33,704,525 outstanding as of December 31, 2018 and 75,000,000 shares authorized; 33,021,170 issued and 32,878,091 outstanding as of December 31, 2017, respectively | 34 | 33
Additional paid-in capital | 52,221 | 50,495
Retained Earnings (accumulated deficit) | 35,513 | (28,496)
Total stockholders’ equity | 87,768 | 22,032
Total liabilities and stockholders’ equity | $ 95,610 | $ 30,988

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