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Stockholders' Equity - Common Stock Subject to Forfeiture (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended		12 Months Ended
	Oct. 31, 2014	Oct. 31, 2013	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Schedule of Restricted Stock [Line Items]
Shares outstanding (in shares)			53,363,013	51,165,000
Stock-based compensation expense			$ 9,643	$ 7,730	$ 6,753
Restricted Common Stock
Schedule of Restricted Stock [Line Items]
Shares outstanding (in shares)			0
Restricted Common Stock | SoCoCare
Schedule of Restricted Stock [Line Items]
Restricted common stock granted		118,577
Value per share (in dollars per share)		$ 8.48
Award vesting, percentage of award	50.00%
Restricted common stock outstanding (in shares)					59,289
Awards vested due to acceleration (in shares)				37,905
Unvested awards forfeited (in shares)				21,384
Stock-based compensation expense					$ 700

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[Line Items] for Schedule of Restricted Stock [Table]

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Share-based Compensation Arrangement by Share-based Payment Award, Value of Award, Per Share

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Percentage of vesting of share-based compensation awards.

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