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Stockholders' Equity - Equity Issuances (Details) |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 14, 2016 USD ($) clinical_trial_subject $ / shares | Feb. 28, 2018 USD ($) shares | Nov. 30, 2015 USD ($) shares | Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 shares | Aug. 31, 2018 USD ($) shares
Class of Stock [Line Items] |  |  |  |  |  |  |
Common Stock Warrants, Shares | shares |  |  |  |  | 209,818 |  |
H.C. Wainwright Sales Agreement [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues | shares |  |  |  | 149,041 |  |  |
Sale Of Stock, Aggregate Offering Amount Authorized Per Agreement |  | $ 12,000,000 |  |  |  |  |
Sale Of Stock, Maximum Number Of Shares Authorized Per Agreement | shares |  | 2,790,697 |  |  |  |  | 4,921,260
Sale Of Stock, Commission On Gross Proceeds Due To Third Party Upon, Percent |  | 3.00% |  |  |  |  |
Proceeds from Issuance of Common Stock |  |  |  | $ 1,000,000 |  |  |
H.C. Wainwright Sales Amended Agreement [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Sale Of Stock, Aggregate Offering Amount Authorized Per Agreement |  |  |  |  |  |  | $ 25,000,000
RD Purchase Agreement [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Shares Issued, Price Per Share | $ / shares | $ 4.72 |  |  |  |  |  |
Private Purchase Agreement [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues | shares |  |  |  |  | 932,204 | 1,400,000 |
Proceeds from Issuance of Common Stock, Initial Closing | $ 6,600,000 |  |  |  |  |  |
Proceeds from Issuance of Common Stock, Second Closing |  |  |  |  | $ 4,400,000 |  |
Number of Subjects, Phase 2 CLBS03 Clinical Trial, Second Closing | clinical_trial_subject | 70 |  |  |  |  |  |
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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