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Stockholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  |  |  |  | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 10, 2018 | Jul. 11, 2018 | May 18, 2018 | Nov. 14, 2017 | Aug. 22, 2017 | Apr. 17, 2017 | Jan. 01, 2017 | Jan. 01, 2016 | Jun. 30, 2018 | Dec. 30, 2017 | Mar. 31, 2018 | May 31, 2017
Serial Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Authorized |  |  |  |  |  |  |  |  | 10,000,000 | 10,000,000 |  |
Preferred Stock, Par or Stated Value Per Share |  |  |  |  |  |  |  |  | $ 0.001 | $ 0.001 |  |
Preferred Stock, Shares Outstanding |  |  |  |  |  |  |  |  | 0 | 0 |  |
Number of Shares Issued when Right is Exercised |  |  |  |  |  | 0.001 |  |  |  |  |  |
Purchase price per share |  |  | $ 0.148 |  | $ 0.60 | $ 6.56 |  |  |  |  |  |
Number of Days Rights are to be Distributed |  |  |  |  |  | 10 days |  |  |  |  |  |
Minimum Beneficial Ownership Percentage for Rights to be Distributed |  |  |  |  |  | 15.00% |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized |  |  |  |  |  |  |  |  | 150,000,000 | 150,000,000 |  | 90,000,000
Common stock shares issued |  |  | 5,405,405 |  | 8,500,000 |  |  |  |  |  |  |
Proceeds from issuance of common stock |  |  | $ 800 |  | $ 4,400 |  |  |  | $ 4,612 |  |  |
Stock-Based Compensation |  |  |  |  |  |  |  |  |  |  |  |
Shares available for issuance |  |  |  |  |  |  |  |  | 2,248,817 |  |  |
Shares authorized for issuance |  |  |  |  |  |  |  |  | 12,605,566 |  |  |
Automatic annual increase in shares authorized as percentage of common stock outstanding |  |  |  |  |  |  | 2.50% | 5.00% |  |  |  |
Automatic annual increase in shares authorized, subject to adjustment for corporate actions |  |  |  |  |  |  |  |  | 1,200,000 |  |  |
Rate of vesting of options granted |  |  |  |  |  |  |  |  | 25.00% |  |  |
Vesting period of options granted, in years |  |  |  |  |  |  |  |  | 4 years |  |  |
Expiration of vested options, period from date of grant |  |  |  |  |  |  |  |  | 10 years |  |  |
Series A Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Serial Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Authorized |  |  |  |  |  |  |  |  | 1,000,000 | 1,000,000 |  |
Preferred Stock, Par or Stated Value Per Share |  |  |  |  |  |  |  |  | $ 0.001 | $ 0.001 |  |
Preferred Stock, Shares Outstanding |  |  |  |  |  |  |  |  |  | 0 | 0 |
Stock-Based Compensation |  |  |  |  |  |  |  |  |  |  |  |
Shares available for issuance |  |  |  |  |  | 1,000,000 |  |  |  |  |  |
ATM Program |  |  |  |  |  |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Service fee percentage |  |  |  | 3.00% |  |  |  |  |  |  |  |
Common stock shares issued |  |  |  | 25,983,098 |  |  |  |  | 17,088,876 | 25,983,098 |  |
Aggregate gross proceeds agent can sell shares of stock |  |  |  | $ 9,000 |  |  |  |  |  |  |  |
Proceeds from issuance of common stock |  |  |  | $ 6,600 |  |  |  |  | $ 3,800 | $ 6,600 |  |
ATM Program | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Common stock shares issued | 8,978,094 | 8,978,094 |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock | $ 1,300 | $ 1,300 |  |  |  |  |  |  |  |  |  |

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