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Stockholders' Equity - Equity Issuances (Details) |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 14, 2016 USD ($) clinical_trial_subject $ / shares shares | Mar. 10, 2016 USD ($) $ / shares shares | Nov. 30, 2015 USD ($) shares | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 shares
Class of Stock [Line Items] |  |  |  |  |
Common stock, shares, issued (shares) | shares |  | 141,844 |  | 9,483,911 | 8,205,790
Common Stock Warrants, Shares | shares |  | 141,844 |  |  | 388,062
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares |  | $ 10.00 |  |  |
Share Price | $ / shares |  | $ 7.05 |  |  |
Proceeds from Issuance of Warrants |  | $ 1,000,000 |  |  |
RD Purchase Agreement [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Stock Issued During Period, Shares, New Issues | shares | 847,458 |  |  |  |
Shares Issued, Price Per Share | $ / shares | $ 4.72 |  |  |  |
Proceeds from Issuance of Common Stock | $ 4,000,000 |  |  |  |
Private Purchase Agreement [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Stock Issued During Period, Shares, New Issues | shares |  |  |  | 932,204 |
Purchase Commitment, Maximum Amount Committed, Shares | shares | 4,449,153 |  |  |  |
Proceeds from Issuance of Common Stock, Initial Closing | $ 12,600,000 |  |  |  |
Proceeds from Issuance of Common Stock, Second Closing | $ 8,400,000 |  |  | $ 4,400,000 |
Number of Subjects, Phase 2 CLBS03 Clinical Trial, Second Closing | clinical_trial_subject | 70 |  |  |  |
Proceeds from Issuance of Common Stock, Initial Closing, Receivable |  |  |  | 6,000,000 |
Proceeds from Issuance of Common Stock, Second Closing, Receivable |  |  |  | $ 4,000,000 |
Aspire Capital Purchase Agreement [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Purchase Commitment, Maximum Amount Committed, Shares | shares |  |  | 1,101,928 |  |
Purchase Commitment, Remaining Minimum Amount Committed |  |  | $ 30,000,000 |  |
Term Of Agreement In Months |  |  | 24 months |  |
Shares, Issued | shares |  |  |  | 319,776 |
Financial Instruments Subject to Mandatory Redemption, Settlement Terms, Fair Value of Shares |  |  |  | $ 1,500,000 |

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