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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
	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	20,125,009us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted	20,124,574us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted	16,883,716us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted	786,986us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted	782,335us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted	726,987us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted	614,662us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted	612,836us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted	14,548,516us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted	684,330us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted	609,344us-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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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.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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Amount of decrease to net income for accretion of temporary equity to its redemption value to derive net income apportioned to common stockholders.

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Average number of shares or units issued and outstanding that are used in calculating basic and diluted earnings per share (EPS).

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