Debt Instrument, Additional Amount Over Closing Bid Price

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- Definition

Debt Instrument, Period After Product Candidate is Approved to Reach Maturity Date

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- Definition

Debt Instrument, Prepayment Percent of Outstanding Principal

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- Definition

Debt Instrument, Required Written Notice Period Prior to Exercise of Put Right

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- Definition

Derivative Liability, Sensitivity Analysis Of Fair Value, Impact Of 5 Percent Change In Estimated Credit Spread

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- Definition

Derivative Liability, Sensitivity Analysis Of Fair Value, Impact Of 5 Percent Change To The Probability Of A Change Of Control Event Occurring In The Next Fiscal Year

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No definition available.

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- Definition

Derivative Liability, Sensitivity Analysis Of Fair Value, Impact Of 5 Percent Change To The Probability Of A Change Of Control Event Occurring In Year Two

+ References

No definition available.

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- Definition

Amount of amortization expense attributable to debt discount (premium) and debt issuance costs.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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- Definition

Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

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- Definition

The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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- Definition

The price per share of the conversion feature embedded in the debt instrument.

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- Definition

Remaining amortization period for discount on the liability component of convertible debt which may be settled in cash upon conversion, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Face (par) amount of debt instrument at time of issuance.

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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Amount, after accumulated amortization, of debt discount.

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- Definition

Value of input used to measure derivative liability.

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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

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Convertible Notes - Narrative (Details)	1 Months Ended	3 Months Ended
Convertible Notes - Narrative (Details)	Sep. 30, 2016 USD ($) $ / shares shares	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)
Debt Instrument [Line Items]
Debt discount		$ 18,003,000		$ 18,003,000
Expected term		5 years
Impact of 5% change in probability of change of control event in 2019		$ 300,000
Impact of 5% change in probability of change of control event in 2020		100,000
Impact of 5% change in the estimated credit spread		200,000
Derivative revaluation income (expense)		55,000	$ (63,000)
Warrants Issued With September 2016 Convertible Notes
Debt Instrument [Line Items]
Debt discount		9,598,000		9,598,000
Compounded Bifurcated Derivatives
Debt Instrument [Line Items]
Debt discount		1,267,000		$ 1,267,000
Beneficial Conversion Feature
Debt Instrument [Line Items]
Debt discount		$ 7,200,000
Compounded Bifurcated Derivatives \| Binomial Lattice Model \| Dividend yield
Debt Instrument [Line Items]
Derivative liability, measurement input		0		0
Warrants Issued With September 2016 Convertible Notes
Debt Instrument [Line Items]
Warrants issued to purchase common stock (in shares) \| shares	1,205,840
Convertible Debt
Debt Instrument [Line Items]
Convertible debt principal	$ 18,087,500
Interest rate	4.00%
Additional amount over closing bid price (in usd per share) \| $ / shares	$ 0.12625
Period after product candidate FCX-007 is approved to reach maturity	180 days
Required written notice period prior to exercise of put right	180 days
Prepayment as a percent of outstanding principal	101.00%
Principal value notes and related accrued interest converted to common stock		$ 0
Debt discount		18,100,000
Amortization of debt discount		$ 0	$ 0
Effective yield		1157.00%
Convertible Debt \| Minimum
Debt Instrument [Line Items]
Conversion price (in dollars per share) \| $ / shares	$ 17.04375
Convertible Debt \| Maximum
Debt Instrument [Line Items]
Conversion price (in dollars per share) \| $ / shares	$ 18.39375