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Stock Based Compensation - Summary of Stock Option Activity (Details)	9 Months Ended
	Sep. 30, 2018 $ / shares shares
Share-based Payment Arrangement [Abstract]
Number of Shares Common stock options, outstanding at Beginning balance | shares	2,176,637
Number of Shares Common stock options, Granted | shares	8,131,750
Number of Shares Common stock options, Exercised | shares	(125,000)
Number of Shares Common stock options, Forfeited | shares	(435,285)
Number of Shares Common stock options, Expired | shares	(54,271)
Number of Shares Common stock options, outstanding at Ending balance | shares	9,693,831
Number of Shares Common stock options, exercisable at Ending balance | shares	1,264,995
Weighted Average Exercise Price, outstanding at Beginning balance | $ / shares	$ 1.25
Weighted Average Exercise Price, Granted | $ / shares	0.84
Weighted Average Exercise Price, Exercised | $ / shares	0.20
Weighted Average Exercise Price, Forfeited | $ / shares	1.57
Weighted Average Exercise Price, Expired | $ / shares	1.60
Weighted Average Exercise Price, outstanding at Beginning balance | $ / shares	0.63
Weighted Average Exercise Price, exercisable at Beginning balance | $ / shares	$ 1.31
Weighted Average Remaining Contractual Life (in Years), outstanding at Beginning balance	9 years 2 months 30 days
Weighted Average Remaining Contractual Life (in Years), outstanding at Ending balance	9 years 6 months 29 days
Weighted Average Remaining Contractual Life (in Years), exercisable at Ending balance	8 years 8 months 9 days

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Weighted Average Remaining Contractual Life (in Years), outstanding at Ending balance.

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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.

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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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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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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.

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Gross 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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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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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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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of share options (or share units) exercised during the current period.

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