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Subsequent Event (Details Textual) - USD ($) $ in Thousands		1 Months Ended	12 Months Ended
	Jan. 25, 2019	Feb. 22, 2019	Dec. 31, 2018	Dec. 31, 2017
Subsequent Event [Line Items]
Common stock, shares issued			13,924,058	11,775,062
Proceeds from the issuance of common stock			$ 3,532	$ 6,551
Sales Agreement
Subsequent Event [Line Items]
Aggregate offering price of common stock authorized			$ 10,200
Common stock, shares issued			2,133,828	2,677,525
Net proceeds from issuance of common stock			$ 3,400	$ 6,100
Subsequent Event | Sales Agreement
Subsequent Event [Line Items]
Aggregate offering price of common stock additional authorized offering amount under agreement to sell	$ 2,500
Aggregate offering price of common stock authorized	$ 12,700
Common stock, shares issued		4,431,053
Proceeds from the issuance of common stock		$ 2,500
Net proceeds from issuance of common stock		$ 2,400

X

- Definition

Common stock additional authorized offering amount under agreement to sell.

+ References

No definition available.

+ Details

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X

- Definition

Common stock, authorized offering amount under agreement to sell.

+ References

No definition available.

+ Details

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X

- Definition

The cash inflow associated with the amount received from entity's raising of capital via registered direct offering, net of related financing costs.

+ References

No definition available.

+ Details

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- Definition

Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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X

- Definition

The cash inflow from the additional capital contribution to the entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585

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X

- Definition

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.

+ References

No definition available.

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