Stock Based Compensation - Schedule of Share-based Compensation, Stock Options, Activity (Details) - $ / shares	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Number of Options Outstanding at beginning of period	2,555,835
Number of Options Granted
Number of Options Forfeited or Expired	(146,950)
Number of Options Outstanding at end of period	2,043,885
Number of Options exercisable at end of period	2,168,304
Weighted-Average Exercise Price Options Outstanding at beginning of period	$ 10.69
Weighted-Average Exercise Price Options Granted
Weighted-Average Exercise Price Options Forfeited or Expired	10.03
Weighted-Average Exercise Price Options Outstanding at end of period	10.73
Weighted-Average Exercise Price Options exercisable at end of period	$ 11.69
Stock Options [Member]
Weighted-Average Exercise Price Options Granted		$ 1.89
Stock Options [Member] \| Employees [Member]
Number of Options Outstanding at beginning of period	2,190,835
Number of Options Granted
Number of Options Forfeited or Expired	(146,950)
Number of Options Outstanding at end of period	2,043,885
Number of Options exercisable at end of period	1,803,304
Stock Options [Member] \| Non Employees [Member]
Number of Options Outstanding at beginning of period	365,000
Number of Options Granted
Number of Options Forfeited or Expired
Number of Options Outstanding at end of period	365,000
Number of Options exercisable at end of period	365,000

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iii)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Weighted average price of options that were either forfeited or expired.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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- Definition

The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-SubTopic 10
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-Paragraph 2
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Net number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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-Publisher FASB
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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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