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Net Loss Per Share Attributable to Common Stockholders - Schedule of Basic and Diluted Net Loss Per Common Share (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Earnings Per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net loss |  |  |  |  |  |  |  |  | $ (23,342)us-gaap_NetIncomeLoss | $ (17,143)us-gaap_NetIncomeLoss | $ (22,101)us-gaap_NetIncomeLoss
Accretion of preferred stock issuance costs to redemption value |  |  |  |  |  |  |  |  |  |  | (73)us-gaap_TemporaryEquityAccretionToRedemptionValueAdjustment
Net loss attributable to common stockholders | $ (7,467)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ (5,558)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ (7,403)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ (2,914)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ (3,480)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ (3,198)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ (4,893)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ (5,572)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ (23,342)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ (17,143)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ (22,174)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Weighted-average number of common shares — basic and diluted | 20,125,009 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted | 20,124,574 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted | 16,883,716 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted | 786,986 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted | 782,335 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted | 726,987 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted | 614,662 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted | 612,836 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted | 14,548,516 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted | 684,330 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted | 609,344 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted
Net loss per share attributable to common stockholders — basic and diluted | $ (0.37)us-gaap_EarningsPerShareBasicAndDiluted | $ (0.28)us-gaap_EarningsPerShareBasicAndDiluted | $ (0.44)us-gaap_EarningsPerShareBasicAndDiluted | $ (3.70)us-gaap_EarningsPerShareBasicAndDiluted | $ (4.45)us-gaap_EarningsPerShareBasicAndDiluted | $ (4.40)us-gaap_EarningsPerShareBasicAndDiluted | $ (7.96)us-gaap_EarningsPerShareBasicAndDiluted | $ (9.09)us-gaap_EarningsPerShareBasicAndDiluted | $ (1.60)us-gaap_EarningsPerShareBasicAndDiluted | $ (25.05)us-gaap_EarningsPerShareBasicAndDiluted | $ (36.39)us-gaap_EarningsPerShareBasicAndDiluted

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- Definition The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. + References No definition available. + Details
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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=6519514 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=6518256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.19) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.18) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.22) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 19 -Article 5 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 20 -Article 9 + Details
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- Definition Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1377-109256 + Details
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