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CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Current assets: |  |
Cash and cash equivalents | $ 34,740 | $ 46,563
Restricted cash | 487 | 971
Accounts receivable | 23,377 | 5,339
Unbilled receivables | 1,192 | 404
Inventories | 9,092 | 10,344
Prepaid expenses and other current assets | 3,849 | 1,403
Total current assets | 72,737 | 65,024
Inventories, long-term |  | 3,155
Property, plant and equipment, net | 172,202 | 104,096
Deferred financing costs, net | 892 | 1,154
Other assets | 971 | 23
Total assets | 246,802 | 173,452
Current liabilities: |  |
Accounts payable | 26,123 | 1,663
Accrued and other expenses | 7,576 | 2,430
Deferred revenue | 0 | 1,615
Income taxes payable |  | 7,058
Current portion of equipment financing obligations | 572 | 674
Current portion of notes payable | 288 | 282
Total current assets | 34,559 | 13,722
Equipment financing obligations, net of current portion |  | 572
Notes payable, net of current portion |  | 288
Deferred tax liabilities, long-term, net | 13,239 | 15,044
Asset retirement obligation | 8,982 | 1,384
Total liabilities | 56,780 | 31,010
Commitments and contingencies (Note 21) |  |
Stockholders’ equity |  |
Common stock, $0.001 par value, 350,000,000 shares authorized; 40,474,085 issued and 40,393,033 outstanding at December 31, 2017; 38,884,068 issued and 38,816,474 outstanding at December 31, 2016 | 40 | 39
Treasury stock, at cost, 81,052 shares and 67,594 shares at December 31, 2017 and 2016, respectively | (666) | (539)
Additional paid-in capital | 159,059 | 132,879
Retained earnings | 31,589 | 10,063
Total stockholders’ equity | 190,022 | 142,442
Total liabilities and stockholders’ equity | $ 246,802 | $ 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=82887183&loc=d3e6676-107765 + Details
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- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + 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(13)) -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(14)) -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 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(8)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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