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Net (Loss) Income Per Share Available to Common Stockholders - Reconciliation of Numerator and Denominator Used in Calculation of Basic and Diluted Net Income (Loss) per Share Available to Common Stockholders (Details) - USD ($) $ / shares in Units, shares in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017
Numerator |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net (loss) income | $ (3,012,000) | $ (4,578,000) | $ (1,947,000) | $ (3,806,000) | $ (1,318,000) |  | $ 26,344,000 |  | $ 285,000 |  | $ (10,715,000) |  | $ (13,343,000) | $ 14,596,000
Less: Deemed dividend on convertible preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  | (5,603,000)
Less: Allocation of undistributed earnings to participating securities |  |  |  |  |  |  |  |  |  |  |  |  | 0 | (3,279,000)
Net (loss) income available to common stockholders, basic |  |  |  |  |  |  |  |  |  |  |  |  | (13,343,000) | 5,714,000
Adjustments to undistributed earnings allocated to participating securities |  |  |  |  |  |  |  |  |  |  |  |  |  | 96,000
Net (loss) income available to common stockholders, diluted |  |  |  |  |  |  |  |  |  |  |  |  | $ (13,343,000) | $ 5,810,000
Denominator |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average shares used in computing basic net (loss) income per share available to common stockholders |  |  |  |  |  |  |  |  |  |  |  |  | 8,373 | 7,619
Effect of dilutive stock options |  |  |  |  |  |  |  |  |  |  |  |  |  | 360
Effect of dilutive warrants |  |  |  |  |  |  |  |  |  |  |  |  |  | 1
Weighted average shares used in computing diluted net (loss) income per share available to common stockholders |  |  |  |  |  |  |  |  |  |  |  |  | 8,373 | 7,980
Basic net (loss) income per share of common stock | $ (0.35) | $ (0.55) | $ (0.23) | $ (0.46) | $ (0.16) |  | $ 2.06 |  | $ 0.02 |  | $ (2.37) |  | $ (1.59) | $ 0.75
Diluted net (loss) income per share of common stock | $ (0.35) | $ (0.55) | $ (0.23) | $ (0.46) | $ (0.16) | [1] | $ 1.98 | [1] | $ 0.02 | [1] | $ (2.37) | [1] | $ (1.59) | $ 0.73
[1] | For the quarters ended June 30, 2017 and September 30, 2017, the Company’s diluted net income per share of common stock was computed by giving effect to all potentially dilutive common stock equivalents outstanding during each of these periods.

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- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=114873790&loc=SL114874131-224263 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109260490&loc=d3e1337-109256 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=109256448&loc=d3e4984-109258 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22694-107794 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109260490&loc=d3e1252-109256 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60B -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109260490&loc=SL5780133-109256 + Details
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