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Shareholders' Equity - Equity Issuances (Details) $ / shares in Units, $ in Millions |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 22, 2017 USD ($) shares | Sep. 14, 2016 USD ($) clinical_trial_subject $ / shares shares | Nov. 30, 2015 USD ($) shares | Mar. 31, 2017 USD ($) | Jun. 30, 2017 USD ($) shares | Dec. 31, 2016 shares | May 31, 2015 shares | May 01, 2015 USD ($)
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Common Stock Warrants, Shares | shares |  |  |  |  | 285,462 | 388,062 |  |
Shares Issued, Price Per Share | $ / shares |  | $ 4.72 |  |  |  |  |  |
Common stock, shares issued | shares |  |  |  |  | 8,912,602 | 8,205,791 |  |
RD Purchase Agreement [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues | shares | 423,729 | 847,458 |  |  |  |  |  |
Proceeds from Issuance of Common Stock | $ 2.0 | $ 4.0 |  |  |  |  |  |
Private Purchase Agreement [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Proceeds from Issuance of Common Stock |  |  |  | $ 6.0 |  |  |  |
Proceeds from Issuance of Common Stock, Second Closing, Receivable |  |  |  | $ 4.0 |  |  |  |
Purchase Commitment, Maximum Amount Committed, Shares | shares |  | 4,449,153 |  |  |  |  |  |
Proceeds from Issuance of Common Stock, Initial Closing |  | $ 12.6 |  |  |  |  |  |
Proceeds from Issuance of Common Stock, Second Closing |  | $ 8.4 |  |  |  |  |  |
Number of Subjects, Phase 2 CLBS03 Clinical Trial, Second Closing | clinical_trial_subject |  | 70 |  |  |  |  |  |
Aspire Capital Purchase Agreement [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Proceeds from Issuance of Common Stock |  |  |  |  | $ 1.2 |  |  |
Purchase Commitment, Maximum Amount Committed, Shares | shares |  |  | 1,101,927.6 |  |  |  |  |
Purchase Commitment, Remaining Minimum Amount Committed |  |  | $ 30.0 |  |  |  |  |
Term of agreement in months |  |  | 24 months |  |  |  |  |
Stock Issued During Period, Shares, Other | shares |  |  | 84,269.6 |  | 210,506 |  |  |
Shares, Issued | shares |  |  |  |  | 319,776 |  |  |
Common Stock, Value, Issued |  |  |  |  | $ 1.5 |  |  |
Discount Applied To Weighted Average Price |  |  | 5.00% |  |  |  |  |
Aspire Capital Purchase Agreement [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Purchase Commitment, Remaining Minimum Amount Committed |  |  |  |  |  |  |  | $ 30.0
Common stock, shares issued | shares |  |  |  |  |  |  | 36,483.7 |

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