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CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Current assets: |  |
Cash | $ 72,671 | $ 46,563
Restricted cash | 972 | 971
Accounts receivable | 9,440 | 5,339
Unbilled receivables | 1,357 | 404
Inventories | 9,080 | 10,344
Prepaid expenses and other current assets | 1,584 | 1,403
Total current assets | 95,104 | 65,024
Inventories, long-term | 111 | 3,155
Property, plant and equipment, net | 104,403 | 104,096
Deferred financing costs, net | 1,236 | 1,154
Other assets | 23 | 23
Total assets | 200,877 | 173,452
Current liabilities: |  |
Accounts payable | 2,168 | 1,663
Accrued and other expenses | 5,225 | 2,430
Deferred revenue | 0 | 1,615
Income taxes payable | 7,249 | 7,058
Current portion of equipment financing obligations | 640 | 674
Current portion of notes payable | 278 | 282
Total current liabilities | 15,560 | 13,722
Equipment financing obligations, net of current portion | 502 | 572
Notes payable, net of current portion | 288 | 288
Deferred tax liabilities, long-term, net | 15,368 | 15,044
Asset retirement obligation | 1,404 | 1,384
Total liabilities | 33,122 | 31,010
Commitments and contingencies (Note 20) |  |
Stockholders’ equity |  |
Common stock, $0.001 par value, 350,000,000 shares authorized; 40,406,068 issued and 40,338,474 outstanding at March 31, 2017; 38,884,068 issued and 38,816,474 outstanding at December 31, 2016 | 40 | 39
Treasury stock, at cost, 67,594 shares at March 31, 2017 and December 31, 2016, respectively | (539) | (539)
Additional paid-in capital | 157,222 | 132,879
Retained earnings | 11,032 | 10,063
Total stockholders’ equity | 167,755 | 142,442
Total liabilities and stockholders’ equity | $ 200,877 | $ 173,452

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- Definition Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(8)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(7)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 + Details
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