Document and Entity Information [Abstract] Document and Entity Information [Abstract] Document Type Amendment Flag Document Period End Date Document Fiscal Year Focus Document Fiscal Period Focus Entity Registrant Name Entity Central Index Key Current Fiscal Year End Date Entity Filer Category Trading Symbol Entity Common Stock, Shares Outstanding Entity Emerging Growth Company Entity Small Business Statement of Financial Position [Abstract] Statement [Table] Statement [Table] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Statement [Line Items] Statement [Line Items] Assets [Abstract] ASSETS Assets, Current [Abstract] Current Assets: Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents Cash and cash equivalents at the beginning of the period Cash and cash equivalents at end of the period Short-term Investments Short-term deposit (Note 4) Nontrade Receivables, Current Account receivable Prepaid Expense and Other Assets, Current Prepaid expenses and other current assets (Note 5) Assets, Current Total current assets Assets, Noncurrent [Abstract] Long-Term Assets: Prepaid Expense and Other Assets Prepaid expenses and other long-term assets (Note 5) Property, Plant and Equipment, Net Property and Equipment, Net Other Assets, Noncurrent Total long-term assets Operating Lease, Right-of-Use Asset ROU assets Assets Total assets Liabilities and Equity [Abstract] LIABILITIES AND STOCKHOLDERS' EQUITY Liabilities, Current [Abstract] Current Liabilities: Accounts Payable, Current Accounts payable Accrued Liabilities, Current Accrued expenses Deferred Grant Income Deferred grant income (Note 7) The carrying value for deferred grant income was received. Accounts Payable, Other, Current Other accounts payable Liabilities, Current Total current liabilities Liabilities Total liabilities Stockholders' Equity Attributable to Parent [Abstract] Stockholders' Equity: Common Stock, Value, Issued Stock capital: (Note 8) Common stock of $0.00005 par value - Authorized: 100,000,000 shares at each of March 31, 2019 and December 31, 2018; Issued and outstanding: 21,490,610 and 20,757,816 shares at March 31, 2019 and December 31, 2018, respectively. Additional Paid in Capital, Common Stock Additional paid-in-capital Retained Earnings (Accumulated Deficit) Accumulated deficit Stockholders' Equity Attributable to Parent Total stockholders' equity Balance Balance Receipts On Account Of Shares Receipts on account of shares These lines are represents that shares receipts Liabilities and Equity Total liabilities and stockholders' equity Liabilities, Noncurrent [Abstract] Long-Term Liabilities: Operating Lease, Liability, Noncurrent Lease liability Liabilities, Noncurrent Total long-term liabilities Balance Sheet Parenthetical [Abstract] Balance Sheet Parenthetical Scenario [Axis] Scenario, Unspecified [Domain] Common Stock, Par or Stated Value Per Share Common stock, par value (in dollars per share) Common Stock, Shares Authorized Common stock, shares Authorized Common Stock, Shares, Issued Common stock, shares Issued Common Stock, Shares, Outstanding Common stock, shares outstanding Income Statement [Abstract] Operating Expenses [Abstract] Operating expenses: Research and Development Expense Research and development, net General and Administrative Expense General and administrative Operating Income (Loss) Operating loss Financial Expenses Income Net Financial expenses (income), net Amount of financial expenses (income), net during the period. Net Income (Loss) Attributable to Parent Net loss Net loss Net loss Income (Loss) from Continuing Operations, Per Basic and Diluted Share Basic and diluted net loss per share from continuing operations Weighted Average Number of Shares Outstanding, Basic and Diluted Weighted average number of shares outstanding used in computing basic and diluted net loss per share Statement of Stockholders' Equity [Abstract] Equity Components [Axis] Statement, Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common Stock [Member] Common Stock [Member] Additional Paid-in Capital [Member] Additional paid-in capital [Member] Retained Earnings [Member] Accumulated Deficit [Member] Receipts on account of shares [Member] Shares, Outstanding Balance (in shares) Balance (in shares) Stock Granted, Value, Share-based Compensation, Net of Forfeitures Stock-based compensation related to warrants and stock granted to service providers Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures Stock-based compensation related to warrants and stock granted to service providers (in shares) Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures Stock-based compensation related to stock and options granted to directors and employees Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures Stock-based compensation related to stock and options granted to directors and employees (in shares) Stock Issued During Period, Value, Stock Options Exercised Exercise of options Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Exercise of options (in shares) Amount of options, Exercised StockIssuedDuringPeriodvalueexerciseAndReissuanceOfWarrants Exercise and reissuance of warrants Value of stock issued in lieu of exercise and re-issuance of warrants. StockIssuedDuringPeriodshareexerciseAndReissuanceOfWarrants Exercise and reissuance of warrants (in shares) Number of stock issued in lieu of exercise and re-issuance of warrants. Statement of Cash Flows [Abstract] Net Cash Provided by (Used in) Operating Activities [Abstract] Cash flows from operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net loss to net cash used in operating activities: Depreciation Depreciation Issuance of Stock and Warrants for Services or Claims Shares and options granted to service providers Stock or Unit Option Plan Expense Deferred Stock-based compensation related to options granted to employees and directors Increase Decrease In Accounts Receivable and Prepaid Expenses Decrease (increase) in accounts receivable and prepaid expenses The increase (decrease) during the reporting period in accounts receivable and prepaid expenses. Increase (Decrease) in Accounts Payable, Trade Increase in trade payables Increase Decrease In Deferred Grant Income Deferred grant income The increase (decrease) Deferred Grant Income during the reporting period. Increase (Decrease) in Other Accounts Payable and Accrued Liabilities Increase (decrease) in other accounts payable and accrued expenses Operating Lease, Expense Change in lease liability Net Cash Provided by (Used in) Operating Activities Total net cash used in operating activities Net Cash Provided by (Used in) Investing Activities [Abstract] Cash flows from investing activities: Payments to Acquire Property, Plant, and Equipment Purchase of property and equipment Payments for (Proceeds from) Investments Changes in short-term deposit Investment In Lease Deposit Investment in lease deposit Amount of investment made in the form of lease deposit during the year. Net Cash Provided by (Used in) Investing Activities Total net cash provided by investing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Cash flows from financing activities: Proceeds from Stock Options Exercised Proceeds from exercise of options Net Cash Provided by (Used in) Financing Activities Total net cash provided by financing activities Cash and Cash Equivalents, Period Increase (Decrease) Increase in cash and cash equivalents General and Going Concern Disclosure [Abstract] Business Description and Basis of Presentation [Text Block] Business Description and Basis of Presentation [Text Block] Accounting Policies [Abstract] Basis of Presentation and Significant Accounting Policies [Text Block] Basis of Presentation and Significant Accounting Policies [Text Block] Research and License Agreement [Abstract] Research and License Agreement [Text Block] Research and License Agreement [Text Block] The entire disclosure on research and license agreement entered by the entity. Cash and Cash Equivalents [Abstract] Short Term Investments [Text Block] he entire disclosure of the components short-term investments. Short-term investments may include current marketable securities. Prepaid Expenses Disclosures [Abstract] Prepaid Expenses Disclosures [Text Block] The entire disclosure for Prepaid Expenses. Leases [Abstract] Leases of Lessee Disclosure [Text Block] Deferred Grant Income [Abstract] Deferred Grant Income [Text Block] The entire disclosure for deferred grant income. Stockholders' Equity Note [Abstract] Stockholders' Equity Note Disclosure [Text Block] Stockholders' Equity Note Disclosure [Text Block] Subsequent Events [Abstract] Subsequent Events [Text Block] Subsequent Events [Text Block] Basis of Accounting, Policy [Policy Text Block] Use of Estimates, Policy [Policy Text Block] New Accounting Pronouncements, Policy [Policy Text Block] Unaudited Interim Financial Statements Policy [Text Block] Disclosure of accounting policy unaudited interim financial statements. Supplemental Cash Flow Information Related To leases [Table Text Block] Tabular disclosure supplemental cash flow information related to leases, Lessee, Operating Lease, Liability, Maturity [Table Text Block] Share-based Compensation, Stock Options, Activity [Table Text Block] Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] Schedule Stock Awards Activity Related To Service Providers [Table Text Block] Tabular disclosure includes the number and weighted-average issue prices for warrants issued to services providers that were outstanding at the beginning and end of the year, and issued during the year. Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] Accounting Policies [Table] Adjustments for New Accounting Pronouncements [Axis] Type of Adoption [Domain] Accounting Standards Update 2016-02 [Member] Accounting Policies [Line Items] Operating Lease, Liability Total lease liability balance Research And License Agreement [Table] Income Statement Location [Axis] Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs, by Report Line [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Research And License Agreement [Line Items] Percentage Of Royalty PaymentIf Licensed Product Covered By Valid Claim Or Orphan Drug Status Percentage Of Royalty Payment If Licensed Product Covered By Valid Claim Or Orphan Drug Status This element represents the percentage of all net sales royalty that the company will pay if the making, producing, manufacturing, using, marketing, selling, importing or exporting of such Licensed Product is covered by a Valid Claim or is covered by Orphan Drug Status Percentage Of Royalty Payment If Licensed Product Not Covered By Valid Claim Or Orphan Drug Status This element represents the percentage of all net sales royalty that the company will pay if the making, producing, manufacturing, using, marketing, selling, importing or exporting of such Licensed Product is not covered by a Valid Claim or is not covered by Orphan Drug Status. Validity Of Royalty Payment Not Covered By Valid Claim Or Orphan Drug Status This element represents the validity of the royalties' payments by the company not covered by a Valid Claim or Orphan Drug Status. Legal Entity [Axis] Entity [Domain] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum [Member] Maximum [Member] Cash and Cash Equivalents [Line Items] Percentage Of Interest Bearing Bank Deposits Percentage of Interest Bearing Bank Deposits Percentage of interest-bearing bank deposits. Maturity of Time Deposits City of Hope [Member] Payments to Suppliers Prepaid Expense, Current Prepaid Expense, Noncurrent Operating Lease, Payments Cash payments for operating leases Right-of-Use Asset Obtained in Exchange for Operating Lease Liability New operating lease assets obtained in exchange for operating lease liabilities Operating Leases, Future Minimum Payments, Remainder of Fiscal Year Remainder of 2019 Operating Leases, Future Minimum Payments Due, Next Twelve Months 2020 Operating Leases, Future Minimum Payments, Due in Two Years 2021 Operating Leases, Future Minimum Payments Due Total future lease payments Lessee, Operating Lease, Liability, Undiscounted Excess Amount Less imputed interest Operating Lease, Weighted Average Remaining Lease Term Operating Lease, Weighted Average Discount Rate, Percent California Institute Of Regenerative Medicine [Member] Proceeds from Grantors Grants Receivable Research and Development Arrangement, Contract to Perform for Others, Compensation Earned Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Number of Shares of Restricted Stock, Nonvested Number of Shares of Restricted Stock, Nonvested Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Granted Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Vested Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Forfeitures Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Weighted Average Grant Date Fair Value, Nonvested Weighted Average Grant Date Fair Value, Nonvested Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Granted Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Vested Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Forfeitures Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms Weighted Average Remaining Contractual Term, Nonvested Award Type [Axis] Award Type [Axis] Equity Award [Domain] Award Type [Domain] Restricted Stock [Member] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Employee Stock Option [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Amount of options, Outstanding at beginning of period Amount of options, Outstanding at end of period Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Amount of options, Granted Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Grants In Period, Gross Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period Amount of options, Cancelled Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number Amount of options, Vested and expected-to-vest at end of period Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Weighted average exercise price, Outstanding at beginning of period (in dollars per share) Weighted average exercise price, Outstanding at end of period (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Weighted average exercise price, Granted (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Weighted average exercise price, Exercised (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Weighted Average exercise Price, Cancelled (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price Weighted average exercise price, Vested and expected-to-vest at end of period (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Aggregate intrinsic value, Outstanding at end of period (in dollars) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value Aggregate intrinsic value, Vested and expected-to-vest at end of period (in dollars)