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Research And Development Arrangement, Upfront Payment Received

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Working Capital

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Face amount or stated value per share of common stock.

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Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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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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The cumulative amount of the reporting entity's undistributed earnings or deficit.

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Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one.

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Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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Business and Organization (Details) $ / shares in Units, $ in Thousands			3 Months Ended
	Apr. 12, 2019 USD ($)	May 24, 2018 $ / shares	Mar. 31, 2019 USD ($) $ / shares	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($) $ / shares	Jul. 02, 2018 $ / shares	Dec. 31, 2017 USD ($)
Subsequent Event [Line Items]
Net loss			$ 3,666	$ 2,901
Cash used in operating activities			3,077	4,761
Cash and cash equivalents			11,322		$ 14,430
Working capital			9,100
Accumulated deficit			$ 192,746		$ 189,080
Stock split, conversion ratio		0.2
Common stock, par value (in dollars per share) \| $ / shares		$ 0.001	$ 0.001		$ 0.001	$ 0.001
Stockholders equity			$ 6,003	$ 6,259	$ 9,557		$ 9,007
Castle Creek Pharmaceuticals, LLC Co-Development And License Agreement \| Subsequent Event
Subsequent Event [Line Items]
Upfront payment received	$ 7,500
First milestone payment receivable	$ 2,500