Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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-Name Accounting Standards Codification
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-SubTopic 10
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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://www.xbrl.org/2003/role/presentationRef
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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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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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Organization and Summary of Significant Accounting Policies - Summary of Stock Option Activity (Details) - $ / shares	3 Months Ended	9 Months Ended
	Mar. 31, 2018	Sep. 30, 2018	Sep. 30, 2017
Number of Shares
Outstanding, beginning balance (in shares)	369,000	369,000
Granted (in shares)	700,000	695,000	0
Cancelled (in shares)		33,000
Outstanding, ending balance (in shares)		1,031,000
Weighted Average Exercise Price
Outstanding, beginning balance (in usd per share)	$ 17.37	$ 17.37
Granted (in usd per share)		2.11
Cancelled (in usd per share)		2.40
Outstanding, ending balance (in usd per share)		$ 7.56
Stock Option \| Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)	4 years
Stock Option \| Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)	1 year